Image capturing optical assembly, imaging apparatus and electronic device

ABSTRACT

An image capturing optical assembly includes, in order from an object side to an image side, a first lens group, a second lens group and a third lens group, wherein the first lens group includes a first lens element and a second lens element, the second lens group includes a third lens element, a fourth lens element and a fifth lens element, and the third lens group includes a sixth lens element, a seventh lens element and an eighth lens element. At least one surface of at least one of the lens elements of each lens group is aspheric. At least one surface of at least one of the lens elements includes at least one inflection point.

RELATED APPLICATIONS

The present application is a continuation of U.S. application Ser. No.16/868,380, filed Jan. 11, 2018, which claims priority to TaiwanApplication Serial Number 106128159, filed Aug. 18, 2017, which isherein incorporated by reference.

BACKGROUND Technical Field

The present disclosure relates to an image capturing optical assemblyand an imaging apparatus. More particularly, the present disclosurerelates to an image capturing optical assembly and an imaging apparatuswith compact size applicable to electronic devices.

DESCRIPTION OF RELATED ART

With the expanding application of photographing modules, installation ofphotographing modules in various electronic products and portableselectronic devices is becoming a major trend in developments for thefuture technology. In addition to the size requirement of photographingmodules for various products, the demand for imaging quality enhancementis also rising with current developments of improved image sensors andimage processing by software, thus conventional lens assemblies cannotsatisfy demands of developments for the future technology.

SUMMARY

According to one aspect of the present disclosure, an image capturingoptical assembly includes, in order from an object side to an imageside, a first lens group, a second lens group and a third lens group,wherein the first lens group includes, in order from the object side tothe image side, a first lens element and a second lens element; thesecond lens group includes, in order from the object side to the imageside, a third lens element, a fourth lens element and a fifth lenselement; and the third lens group includes, in order from the objectside to the image side, a sixth lens element, a seventh lens element andan eighth lens element. Each of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement, the sixth lens element, the seventh lens element, and theeighth lens element has an object-side surface facing towards the objectside and an image-side surface facing towards the image side. At leastone surface of at least one of the lens elements of the first lens groupis aspheric, at least one surface of at least one of the lens elementsof the second lens group is aspheric, and at least one surface of atleast one of the lens elements of the third lens group is aspheric. Atleast one surface of the first lens element, the second lens element,the third lens element, the fourth lens element, the fifth lens element,the sixth lens element, the seventh lens element, and the eighth lenselement includes at least one inflection point. Each of at least two ofthe eight lens elements has an Abbe number smaller than 23.0. When amaximum of refractive indexes of all the lens elements of the imagecapturing optical assembly is Nmax, a minimum of refractive indexes ofall the lens elements of the image capturing optical assembly is Nmin, afocal length of the image capturing optical assembly is f, and anentrance pupil diameter of the image capturing optical assembly is EPD,the following conditions are satisfied:

1.30<Nmax<1.75;

1.20<Nmin<1.60; and

1.0<f/EPD<1.70.

According to another aspect of the present disclosure, an imagecapturing optical assembly includes, in order from an object side to animage side, a first lens group, a second lens group and a third lensgroup, wherein the first lens group includes, in order from the objectside to the image side, a first lens element and a second lens element;the second lens group includes, in order from the object side to theimage side, a third lens element, a fourth lens element and a fifth lenselement; and the third lens group includes, in order from the objectside to the image side, a sixth lens element, a seventh lens element andan eighth lens element. Each of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement, the sixth lens element, the seventh lens element, and theeighth lens element has an object-side surface facing towards the objectside and an image-side surface facing towards the image side. At leastone surface of at least one of the lens elements of the first lens groupis aspheric, at least one surface of at least one of the lens elementsof the second lens group is aspheric, and at least one surface of atleast one of the lens elements of the third lens group is aspheric. Atleast one surface of the first lens element, the second lens element,the third lens element, the fourth lens element, the fifth lens element,the sixth lens element, the seventh lens element, and the eighth lenselement includes at least one inflection point. At least one of theeight lens elements has an Abbe number smaller than 24.0. When a maximumof refractive indexes of all the lens elements of the image capturingoptical assembly is Nmax, a minimum of refractive indexes of all thelens elements of the image capturing optical assembly is Nmin, a focallength of the image capturing optical assembly is f, an entrance pupildiameter of the image capturing optical assembly is EPD, and an axialdistance between the object-side surface of the first lens element andan image surface is TL, the following conditions are satisfied:

1.30<Nmax<1.95;

1.20<Nmin<1.60;

1.0<f/EPD≤1.63; and

TL/f<1.60.

According to another aspect of the present disclosure, an imagecapturing optical assembly includes, in order from an object side to animage side, a first lens group, a second lens group and a third lensgroup, wherein the first lens group includes, in order from the objectside to the image side, a first lens element and a second lens element;the second lens group includes, in order from the object side to theimage side, a third lens element, a fourth lens element and a fifth lenselement; and the third lens group includes, in order from the objectside to the image side, a sixth lens element, a seventh lens element andan eighth lens element. Each of the first lens element, the second lenselement, the third lens element, the fourth lens element, the fifth lenselement, the sixth lens element, the seventh lens element, and theeighth lens element has an object-side surface facing towards the objectside and an image-side surface facing towards the image side. At leastone surface of at least one of the lens elements of the first lens groupis aspheric, at least one surface of at least one of the lens elementsof the second lens group is aspheric, and at least one surface of atleast one of the lens elements of the third lens group is aspheric. Atleast one of the seventh lens element and the eighth lens elementincludes at least one inflection point. At least one of the fourth lenselement, the fifth lens element, the sixth lens element, the seventhlens element and the eighth lens element has an Abbe number smaller than23.0. When a maximum of refractive indexes of all the lens elements ofthe image capturing optical assembly is Nmax, a minimum of refractiveindexes of all the lens elements of the image capturing optical assemblyis Nmin, an entrance pupil diameter of the image capturing opticalassembly is EPD, and an axial distance between the object-side surfaceof the first lens element and an image surface is TL, the followingconditions are satisfied:

1.30<Nmax<1.95;

1.20<Nmin<1.60; and

1.0<TL/EPD<2.27.

According to another aspect of the present disclosure, an imagingapparatus includes the image capturing optical assembly of theaforementioned aspect and an image sensor, wherein the image sensor isdisposed on the image surface of the image capturing optical assembly.

According to another aspect of the present disclosure, an electronicdevice includes the imaging apparatus of the aforementioned aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be more fully understood by reading thefollowing detailed description of the embodiment, with reference made tothe accompanying drawings as follows:

FIG. 1 is a schematic view of an imaging apparatus according to the 1stembodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 1stembodiment;

FIG. 3 is a schematic view of an imaging apparatus according to the 2ndembodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 2ndembodiment;

FIG. 5 is a schematic view of an imaging apparatus according to the 3rdembodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 3rdembodiment;

FIG. 7 is a schematic view of an imaging apparatus according to the 4thembodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 4thembodiment;

FIG. 9 is a schematic view of an imaging apparatus according to the 5thembodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 5thembodiment′

FIG. 11 is a schematic view of an imaging apparatus according to the 6thembodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 6thembodiment;

FIG. 13 is a schematic view of an imaging apparatus according to the 7thembodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 7thembodiment;

FIG. 15 is a schematic view of an imaging apparatus according to the 8thembodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 8thembodiment;

FIG. 17 is a schematic view of an imaging apparatus according to the 9thembodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 9thembodiment;

FIG. 19 is a schematic view of an imaging apparatus according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 10thembodiment;

FIG. 21 is a schematic view of an imaging apparatus according to the11th embodiment of the present disclosure;

FIG. 22 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 11thembodiment;

FIG. 23 is a schematic view of an imaging apparatus according to the12th embodiment of the present disclosure;

FIG. 24 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 12thembodiment;

FIG. 25 is a schematic view of an imaging apparatus according to the13th embodiment of the present disclosure;

FIG. 26 shows spherical aberration curves, astigmatic field curves and adistortion curve of the imaging apparatus according to the 13thembodiment;

FIG. 27 is a schematic view of parameters of the 1st embodiment of thepresent disclosure;

FIG. 28 is a schematic view of critical points and parameters Yc71,Yc72, Yc81 and Yc82 according to the 9th embodiment;

FIG. 29 is a three-dimensional schematic view of an imaging apparatusaccording to the 14th embodiment of the present disclosure;

FIG. 30A is a schematic view of one side of an electronic device 20according to the 15th embodiment of the present disclosure;

FIG. 30B is a schematic view of another side of the electronic device 20of FIG. 30A;

FIG. 30C is a system schematic view of the electronic device of FIG.30A;

FIG. 31 is a schematic view of an electronic device according to the16th embodiment of the present disclosure; and

FIG. 32 is a schematic view of an electronic device according to the17th embodiment of the present disclosure.

DETAILED DESCRIPTION

An image capturing optical assembly includes, in order from an objectside to an image side, a first lens group, a second lens group and athird lens group, wherein the first lens group includes, in order fromthe object side to the image side, a first lens element and a secondlens element; the second lens group includes, in order from the objectside to the image side, a third lens element, a fourth lens element anda fifth lens element; and the third lens group includes, in order fromthe object side to the image side, a sixth lens element, a seventh lenselement and an eighth lens element. Therefore, configuration of theparameters may be more flexible by the arrangement of three lens groups,and it is favorable for balancing the ability of light refraction byproperly matching the characteristics of the lens elements so as tosatisfy the demand of developments for the future technology.

Each of the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element, the sixth lenselement, the seventh lens element, and the eighth lens element has anobject-side surface facing towards the object side and an image-sidesurface facing towards the image side.

At least one surface of at least one of the lens elements of the firstlens group is aspheric, at least one surface of at least one of the lenselements of the second lens group is aspheric, and at least one surfaceof at least one of the lens elements of the third lens group isaspheric. Therefore, it is favorable for correcting off-axisaberrations, such as coma aberration, astigmatism etc., and obtainingsufficient image quality with fewer lens elements.

At least one surface of the first lens element, the second lens element,the third lens element, the fourth lens element, the fifth lens element,the sixth lens element, the seventh lens element, and the eighth lenselement includes at least one inflection point. Therefore, it isfavorable for correcting off-axis aberrations and reducing total tracklength thereof. Preferably, at least one of the seventh lens element andthe eighth lens element can include at least one inflection point.

According to the image capturing optical assembly of the presentdisclosure, there is an air gap between every adjacent lens elements ofthe first lens element, the second lens element, the third lens element,the fourth lens element, the fifth lens element, the sixth lens element,the seventh lens element and the eighth lens element. That is, each ofthe first through eighth lens elements is a single and non-cemented lenselement, and every two lens elements adjacent to each other are notcemented, and there is a space between the two lens elements. Moreover,the manufacturing process of the cemented lenses is more complex thanthe non-cemented lenses. In other words, of the first lens element, thesecond lens element, the third lens element, the fourth lens element,the fifth lens element, the sixth lens element, the seventh lens elementand the eighth lens element of the image capturing optical assembly,there is a gap in a paraxial region between every pair of lens elementsthat are adjacent to each other. In particular, a cementing surface ofone lens element and a cementing surface of the following lens elementneed to have accurate curvature to ensure these two lens elements willbe highly cemented. However, during the cementing process, those twolens elements might not be highly cemented due to displacements and itis thereby not favorable for image quality of the image capturingoptical assembly. Therefore, according to the image capturing opticalassembly of the present disclosure, having an air gap in a paraxialregion between every adjacent lens elements of the first lens element,the second lens element, the third lens element, the fourth lenselement, the fifth lens element, the sixth lens element the seventh lenselement and the eighth lens element of the present disclosure avoids theproblems of the cemented lens elements.

The object-side surface of the first lens element can include at leastone inflection point. Therefore, it is favorable for correctingspherical aberrations generated by the incident light from large fieldof view in the image capturing optical assembly.

The second lens element can have negative refractive power, so thatchromatic aberration can be corrected and aberrations generated from thefirst lens element can be moderated. The object-side surface of thesecond lens element can be convex, and the image-side surface of thesecond lens element can be concave. Therefore, the astigmatism can becorrected so as to allow light converging from sagittal direction andtangential direction.

The seventh lens element can have negative refractive power, which isfavorable for adjusting and balancing the refractive power close to theimage side of the image capturing optical assembly so as to enhance theimage quality. The seventh lens element can have the object-side surfacebeing convex and the image-side surface being concave. Therefore, it isfavorable for correcting the field curvature so as to avoid defocus inthe off-axis field.

The eighth lens element can have negative refractive power, and it isfavorable for controlling the back focal length effectively so as toavoid the total track length of the image capturing optical assemblybeing too long.

When a maximum of refractive indexes of all the lens elements of theimage capturing optical assembly is Nmax, the following condition issatisfied: 1.30<Nmax<1.95. Therefore, the manufacturing of lens elementscan be more flexible so as to calibrate certain parts of lens elementsfor better image quality. Preferably, the following condition can besatisfied: 1.30<Nmax<1.75. More preferably, the following condition canbe satisfied: 1.55<Nmax<1.70.

When a minimum of refractive indexes of all the lens elements of theimage capturing optical assembly is Nmin, the following condition issatisfied: 1.20<Nmin<1.60. Therefore, it is favorable for balancing lensmaterials of the image capturing optical assembly so as to maintainsufficient refraction power and proper differences among lens elements.Preferably, the following condition can be satisfied: 1.35<Nmin<1.58.

When a focal length of the image capturing optical assembly is f, and anentrance pupil diameter of the image capturing optical assembly is EPD,the following condition is satisfied: 1.0<f/EPD<1.70. Therefore, it isfavorable for increasing incident light so as to enhance imageillumination and the image quality. Preferably, the following conditioncan be satisfied: 1.0<f/EPD≤1.63.

At least one of the first lens element, the second lens element, thethird lens element, the fourth lens element, the fifth lens element, thesixth lens element, the seventh lens element and the eighth lens elementhas an Abbe number smaller than 24.0. Therefore, it is favorable forobtaining better dispersion ability so as to compensate excessiverefraction of the short wavelength light in the off-axis region.Preferably, each of at least two of the eight lens elements has the Abbenumber smaller than 23.0. More preferably, at least one of the fourthlens element, the fifth lens element, the sixth lens element, theseventh lens element, and the eighth lens element has the Abbe numbersmaller than 23.0. Further preferably, at least one of the eight lenselements has the Abbe number smaller than 20.

When the focal length of the image capturing optical assembly is f, andan axial distance between the object-side surface of the first lenselement and an image surface is TL, the following condition issatisfied: TL/f<1.60. Therefore, it is favorable for balancing the fieldof view and total track length of the image capturing optical assemblyeffectively in various applications.

When the entrance pupil diameter of the image capturing optical assemblyis EPD, and the axial distance between the object-side surface of thefirst lens element and the image surface is TL, the following conditionis satisfied: 1.0<TL/EPD<2.27. Therefore, it is favorable for satisfyingmarket demands by arranging both of a large aperture and a short totaltrack length of the image capturing optical assembly.

When an axial distance between the aperture stop and the image-sidesurface of the eighth lens element is SD, and an axial distance betweenthe object-side surface of the first lens element and the image-sidesurface of the eighth lens element is TD, the following condition issatisfied: 0.70<SD/TD<1.10. Therefore, the location of the aperture stopis proper for obtaining a sufficient view angle, and balancing the totaltrack length of the image capturing optical assembly and the angle ofthe incident light on the image surface. Preferably, the aperture stopcan be disposed at the object side (or at a position closest to theobject side) in the first lens group. Therefore, it is favorable forcontrolling the angle of the incident light on the image surface, so asto avoid insufficient illumination of the image periphery while reducingthe total track length.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, and an Abbe number of the sixth lenselement is V6, the following condition is satisfied: (V2+V6)/V1<1.0.Therefore, it is favorable for balancing proper corrections of chromaticaberration between the object side and the image side.

When the focal length of the image capturing optical assembly is f, afocal length of the first lens element is f1, a focal length of thesecond lens element is f2, a focal length of the third lens element isf3, a focal length of the fourth lens element is f4, a focal length ofthe fifth lens element is f5, a focal length of the sixth lens elementis f6, a focal length of the seventh lens element is f7, a focal lengthof the eighth lens element is f8, a focal length of i-th lens element isfi, and a maximum of |f/fi| is |f/fi|max, the following condition issatisfied: |f/fi|max<1.50, wherein i=1˜8. Therefore, it is favorable forobtaining sufficient view angle by controlling the refractive power ofthe image capturing optical assembly effectively. Preferably, thefollowing condition can be satisfied: |f/fi|max<1.0, wherein i=1˜8.

When the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, at least one of the lens elements (the first lenselement through the eighth lens element) satisfies the followingcondition: |f/Rf|+|f/Rr|<0.60. Therefore, it is favorable for reducingaberrations by controlling refractive power of the lens elements, andimproving the image quality by adjusting the light path according todifferent fields of view. Preferably, at least one of the lens elementssatisfies the following condition: |f/Rf|+|f/Rr|<0.40. More preferably,at least one of the lens elements satisfies the following condition:|f/Rf|+|f/Rr|<0.20.

When an axial distance between the object-side surface of the first lenselement and the image surface is TL, the following condition issatisfied: TL<12.0 mm. Therefore, it is favorable for reducing the totaltrack length of the image capturing optical assembly so as to controlthe dimensions thereof.

When half of a maximum field of view of the image capturing opticalassembly is HFOV, the following condition is satisfied: 30.0degrees<HFOV<50.0 degrees. Therefore, it is favorable for obtainingproper imaging range of the image capturing optical assembly so as tosatisfy the required field of view in applications. Preferably, thefollowing condition can be satisfied: 35.0 degrees<HFOV<45.0 degrees.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, a maximum image height of theimage capturing optical assembly is ImgH, the focal length of the imagecapturing optical assembly is f, and the entrance pupil diameter of theimage capturing optical assembly is EPD, the following condition issatisfied: 2.0<TL/ImgH+f/EPD≤3.20. Therefore, it is favorable forcontrolling the total track length and the aperture size of the imagecapturing optical assembly so as to fit in compact electronic devicesand obtain high image brightness. Preferably, the following conditioncan be satisfied: 2.0<TL/ImgH+f/EPD≤3.10.

When a total number of inflection points on the object-side surfaces andthe image-side surfaces of all the lens elements (the first lens elementthrough the eighth lens element) of the image capturing optical assemblyis Ninf., the following condition is satisfied: 20<Ninf.<55. Therefore,it is favorable for correcting image distortion in the off-axis regionthereof so as to enhance the peripheral image quality.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, and the maximum image heightof the image capturing optical assembly is ImgH, the following conditionis satisfied: 0.80<TL/ImgH<1.65. Therefore, it is favorable for theimage capturing optical assembly having a compact configuration whileeffectively reducing the total track length thereof with desirable imagedimensions. Preferably, the following condition can be satisfied:0.90<TL/ImgH<1.60.

When a maximum of axial distances between every adjacent lens elementsof the image capturing optical assembly is ATmax, and the maximum imageheight of the image capturing optical assembly is ImgH, the followingcondition is satisfied: ATmax/ImgH<0.30. Therefore, it is favorable forbalancing the lens arrangement and image size so as to improve spaceusage while obtaining the sufficient image size for receiving enoughlight.

When the focal length of the image capturing optical assembly is f, afocal length of the second lens element is f2, and a focal length of thethird lens element is f3, the following condition is satisfied:0.05<(f/f2)+(f/f3)<0.50. Therefore, it is favorable for balancing therefractive power of the second lens element and the third lens elementso as to enhance aberration corrections and reduce the sensitivity.Preferably, the following condition can be satisfied:0.05<(f/f2)+(f/f3)<0.35.

When half of a maximum field of view of the image capturing opticalassembly is HFOV, the focal length of the image capturing opticalassembly is f, and the entrance pupil diameter of the image capturingoptical assembly is EPD, the following condition is satisfied:24.0<HFOV×EPD/f<35.0. Therefore, the field of view and the aperture sizecan be balanced and enhanced while maintaining sufficient imageillumination.

When the entrance pupil diameter of the image capturing optical assemblyis EPD, and a sum of central thicknesses of all the lens elements of theimage capturing optical assembly is ΣCT, the following condition issatisfied: 0.80<EPD/ΣCT<2.0. Therefore, it is favorable for controllingthicknesses of the lens elements effectively so as to avoid thedeformation caused by pressing upon an overly thin lens element or fromuneven molding shrinkage due to excessively thick lens element.

When a curvature radius of the object-side surface of the sixth lenselement is R11, and a curvature radius of the image-side surface of thesixth lens element is R12, the following condition is satisfied:0<(R11−R12)/(R11+R12)<0.80. Therefore, astigmatism and Petzval's sum ofthe image capturing optical assembly can be corrected.

When the focal length of the image capturing optical assembly is f, andthe focal length of the second lens element is f2, the followingcondition is satisfied: −0.55<f/f2<0.55. Therefore, it is favorable foravoiding excessive aberrations by moderating the refractive power of thesecond lens element.

When the axial distance between the object-side surface of the firstlens element and the image surface is TL, the maximum image height ofthe image capturing optical assembly is ImgH, and the entrance pupildiameter of the image capturing optical assembly is EPD, the followingcondition is satisfied: TL{circumflex over ( )}2/(ImgH×EPD)<3.40.Therefore, it is favorable for enhancing the image illumination andreducing the total track length of the image capturing optical assembly.Preferably, the following condition can be satisfied: TL{circumflex over( )}2/(ImgH×EPD)<3.25.

Each of relative distances between every adjacent lens elements of thefirst lens element, the second lens element, the third lens element, thefourth lens element, the fifth lens element, the sixth lens element, theseventh lens element and the eighth lens element is a constant value.Therefore, it is favorable for simplifying the assembling of the imagecapturing optical assembly, reducing the costs, and increasing the yieldrate.

When the entrance pupil diameter of the image capturing optical assemblyis EPD, and an axial distance between the image-side surface of theeighth lens element and the image surface is BL, the following conditionis satisfied: 2.0<EPD/BL<6.2. Therefore, it is favorable for balancingthe back focal length and the aperture size so as to increase the imageillumination and control the back focal length for disposing additionaloptical elements.

When a maximum optical effective radius of the object-side surface ofthe first lens element is Y11, and a maximum optical effective radius ofthe image-side surface of the eighth lens element is Y82, the followingcondition is satisfied: 0.20<Y11/Y82<0.70. Therefore, it is favorablefor maintaining fine appearance by controlling the size of the lenselement on the object side of the image capturing optical assembly, andreducing the size while enlarging the field of view so as to satisfyspecifications of various applications.

At least one of the object-side surface and the image-side surface ofthe eighth lens element includes at least one critical point. When thefocal length of the image capturing optical assembly is f, a verticaldistance of the critical point on the object-side surface of the eighthlens element and an optical axis is Yc81, and a vertical distance of thecritical point on the image-side surface of the eighth lens element andthe optical axis is Yc82, at least one of the following conditions issatisfied: 0.01<Yc81/f<0.90; and 0.01<Yc82/f<0.90. Therefore, it isfavorable for controlling the shape variation of the lens element closeto the image side of the image capturing optical assembly so as tocorrect off-axis aberrations before light projecting on the imagesurface. Preferably, the image-side surface of the eighth lens elementcan include at least one critical point, and the following condition canbe satisfied: 0.01<Yc82/f<0.90. Furthermore, the vertical distance ofthe critical point on the object-side surface or the image-side surfaceof the eighth lens element and the optical axis is Yc8, the followingcondition can be satisfied: Yc8=Yc81 or Yc8=Yc82.

When the Abbe number of the first lens element is V1, an Abbe number ofthe fourth lens element is V4, an Abbe number of the fifth lens elementis V5, and the Abbe number of the sixth lens element is V6, thefollowing condition is satisfied: 1.0<(V4+V5+V6)/V1<2.80. Therefore, itis favorable for controlling the material arrangement of the lenselements in the middle portion of the image capturing optical assemblyso as to obtain sufficient light refractive ability and reduce the totaltrack length.

When the focal length of the image capturing optical assembly is f, anda curvature radius of the image-side surface of the eighth lens elementis R16, the following condition is satisfied: 0.3<f/R16<5.0. Therefore,it is favorable for avoiding excessive total track length by controllingthe back focal length of the image capturing optical assemblyeffectively. Preferably, the following condition can be satisfied:1.0<f/R16<4.5.

When a maximum of axial distances between every adjacent lens elementsof the image capturing optical assembly is ATmax, and a minimum ofcentral thicknesses of all the lens elements of the image capturingoptical assembly is CTmin, the following condition is satisfied:0.1<ATmax/CTmin<5.0. Therefore, the surface variation can be moreflexible by controlling the gaps between adjacent lens elements and thelens thicknesses, so as to obtain better off-axis aberrationcorrections. Preferably, the following condition can be satisfied:0.3<ATmax/CTmin<3.5.

The focal length of the image capturing optical assembly is f, a focallength of the first lens group is fG1, a focal length of the second lensgroup is fG2, and a focal length of the third lens group is fG3, thefollowing conditions are satisfied: 0.1<f/fG1<1.5; −0.4<f/fG2<1.5; and−1.5<f/fG3<0.5. Therefore, it is favorable for satisfying thespecifications of various devices by controlling the refractive power ofthe lens groups.

At least one of the object-side surface and the image-side surface ofthe seventh lens element includes at least one critical point. When thefocal length of the image capturing optical assembly is f, a verticaldistance of the critical point on the object-side surface of the seventhlens element and an optical axis is Yc71, and a vertical distance of thecritical point on the image-side surface of the seventh lens element andthe optical axis is Yc72, at least one of the following conditions issatisfied: 0.01<Yc71/f<0.90; and 0.01<Yc72/f<0.90. Therefore, it isfavorable for controlling the shape variation of the lens element closeto the image side so as to provide better corrections of each off-axisfield of view at different locations. Preferably, the image-side surfaceof the seventh lens element can include at least one critical point, andthe following condition can be satisfied: 0.01<Yc72/f<0.90. Furthermore,the vertical distance of the critical point on the object-side surfaceor the image-side surface of the seventh lens element and the opticalaxis is Yc7, the following condition can be satisfied: Yc7=Yc71 orYc7=Yc72.

At least one surface of at least one of the lens elements of the firstlens group includes at least one inflection point, at least one surfaceof at least one of the lens elements of the second lens group includesat least one inflection point, and at least one surface of at least oneof the lens elements of the third lens group includes at least oneinflection point. Therefore, it is favorable for correcting the off-axisaberrations so as to reduce the total track length and enhance the imagequality.

The first lens group can have positive refractive power, the second lensgroup can have positive refractive power, and the third lens group canhave negative refractive power. Therefore, the refractive power of frontportion, middle portion and rear portion of the image capturing opticalassembly can be distributed effectively so as to enhance the lightconverging ability on the object side and reduce the total track lengththereof.

The image capturing optical assembly can further include a filterdisposed between the eighth lens element and the image surface, whereina central thickness of the filter is CTf, the following condition issatisfied: CTf<0.25 mm. Therefore, it is favorable for arranging theelements of the image capturing optical assembly closely and increasingspace utilization. Preferably, the following condition can be satisfied:CTf<0.14 mm.

When the Abbe number of the second lens element is V2, an Abbe number ofthe third lens element is V3, the Abbe number of the fourth lens elementis V4, and the Abbe number of the fifth lens element is V5, thefollowing condition is satisfied: 0.01<|(V2−V3)/(V4−V5)|. Therefore, itis favorable for correcting aberrations and chromatic aberration byarranging complementary materials of the adjacent lens elements.

When the focal length of the first lens element is f1, and the focallength of the second lens element is f2, the following condition issatisfied: −0.65<f1/f2<2.0. Therefore, it is favorable for strengtheningthe refractive power of the first lens element and balancing aberrationsgenerated from the first lens element by the second lens element.

Each of the aforementioned features of the image capturing opticalassembly can be utilized in various combinations for achieving thecorresponding effects.

According to the image capturing optical assembly of the presentdisclosure, the lens elements thereof can be made of glass or plasticmaterials. When the lens elements are made of glass materials, thedistribution of the refractive power of the image capturing opticalassembly may be more flexible to design. When the lens elements are madeof plastic materials, manufacturing costs can be effectively reduced.Furthermore, surfaces of each lens element can be arranged to beaspheric, since the aspheric surface of the lens element is easy to forma shape other than a spherical surface so as to have more controllablevariables for eliminating aberrations thereof, and to further decreasethe required amount of lens elements in the image capturing opticalassembly. Therefore, the total track length of the image capturingoptical assembly can also be reduced.

According to the image capturing optical assembly of the presentdisclosure, each of an object-side surface and an image-side surface hasa paraxial region and an off-axis region. The paraxial region refers tothe region of the surface where light rays travel close to an opticalaxis, and the off-axis region refers to the region of the surface awayfrom the paraxial region. Particularly unless otherwise stated, when thelens element has a convex surface, it indicates that the surface can beconvex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. According to the image capturing opticalassembly of the present disclosure, the refractive power or the focallength of a lens element being positive or negative may refer to therefractive power or the focal length in a paraxial region of the lenselement.

According to the image capturing optical assembly of the presentdisclosure, the image capturing optical assembly can include at leastone stop, such as an aperture stop, a glare stop or a field stop. Saidglare stop or said field stop is for eliminating the stray light andthereby improving the image resolution thereof.

According to the image capturing optical assembly of the presentdisclosure, the image surface of the image capturing lens assembly,based on the corresponding image sensor, can be flat or curved. Inparticular, the image surface can be a concave curved surface facingtowards the object side. According to the image capturing opticalassembly of the present disclosure, at least one image correctingelement (such as a field flattener) can be selectively disposed betweenthe lens element closest to the image side of the image capturingoptical assembly and the image surface so as to correct the image (suchas the field curvature). Properties of the image correcting element,such as curvature, thickness, refractive index, position, surface shape(convex/concave, spherical/aspheric/diffractive/Fresnel etc.) can beadjusted according to the requirements of the imaging apparatus. Ingeneral, the image correcting element is preferably a thin plano-concaveelement having a concave surface toward the object side and is disposedclose to the image surface.

According to the image capturing optical assembly of the presentdisclosure, an aperture stop can be configured as a front stop or amiddle stop. A front stop disposed between an object and the first lenselement can provide a longer distance between an exit pupil of the imagecapturing optical assembly and the image surface, and thereby obtains atelecentric effect and improves the image-sensing efficiency of theimage sensor, such as CCD or CMOS. A middle stop disposed between thefirst lens element and the image surface is favorable for enlarging thefield of view of the image capturing optical assembly and therebyprovides a wider field of view for the same.

According to the image capturing optical assembly of the presentdisclosure, a critical point is a non-axial point of the lens surfacewhere its tangent is perpendicular to the optical axis, wherein a convexcritical point is a critical point located on a convex shape of the lenssurface, and a concave critical point is a critical point located on aconcave shape of the lens surface.

According to the image capturing optical assembly of the presentdisclosure, an inflection point is defined as a point where center ofcurvature is shifted from the object side to the image side (or from theimage side to the object side) of a curve on the lens surface from aparaxial region thereof to the off-axis region thereof.

According to the image capturing optical assembly of the presentdisclosure, the image capturing lens assembly can be applied to 3D(three-dimensional) image capturing applications, in products such asdigital cameras, mobile devices, digital tablets, smart TVs,surveillance systems, motion sensing input devices, driving recordingsystems, rearview camera systems, and wearable devices.

According to the present disclosure, an imaging apparatus is provided.The imaging apparatus includes the aforementioned image capturingoptical assembly and an image sensor, wherein the image sensor isdisposed on the image side of the aforementioned image capturing opticalassembly, that is, the image sensor can be disposed on or near the imagesurface of the aforementioned image capturing optical assembly. It isfavorable for obtaining more flexible parameter variation by the threelens group and balancing light refraction ability by properly arrangingcharacteristics among the lens elements, so as to satisfy the demand ofdevelopments for the future technology. Preferably, the imagingapparatus can further include a barrel member, a holder member or acombination thereof.

According to the present disclosure, an electronic device is provided,which includes the aforementioned imaging apparatus. Preferably, theelectronic device can further include but not limited to a control unit,a display, a storage unit, a random access memory unit (RAM) or acombination thereof.

According to the above description of the present disclosure, thefollowing 1st-17th specific embodiments are provided for furtherexplanation.

1st Embodiment

FIG. 1 is a schematic view of an imaging apparatus according to the 1stembodiment of the present disclosure. FIG. 2 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 1st embodiment. In FIG. 1, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 196. The image capturing opticalassembly includes, in order from an object side to an image side, afirst lens element 110, an aperture stop 100, a second lens element 120,a third lens element 130, a stop 101, a fourth lens element 140, a fifthlens element 150, a sixth lens element 160, a seventh lens element 170,an eighth lens element 180, a filter 190 and an image surface 195,wherein the image sensor 196 is disposed on the image surface 195 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (110, 120, 130, 140, 150, 160, 170 and 180)without additional one or more lens elements inserted between the firstlens element 110 and the eighth lens element 180, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 110 and thesecond lens element 120 belong to a first lens group (its referencenumeral is omitted). The third lens element 130, the fourth lens element140 and the fifth lens element 150 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 160, the seventhlens element 170 and the eighth lens element 180 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex and an image-side surface 112 beingconcave. The first lens element 110 is made of a plastic material, andhas the object-side surface 111 and the image-side surface 112 beingboth aspheric. Furthermore, each of the object-side surface 111 and theimage-side surface 112 of the first lens element 110 includes at leastone inflection point.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex and an image-side surface 122 beingconcave. The second lens element 120 is made of a plastic material, andhas the object-side surface 121 and the image-side surface 122 beingboth aspheric. Furthermore, the object-side surface 121 of the secondlens element 120 includes at least one inflection point.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex and an image-side surface 132 beingconcave. The third lens element 130 is made of a plastic material, andhas the object-side surface 131 and the image-side surface 132 beingboth aspheric. Furthermore, each of the object-side surface 131 and theimage-side surface 132 of the third lens element 130 includes at leastone inflection point.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being convex and an image-side surface 142 beingconcave. The fourth lens element 140 is made of a plastic material, andhas the object-side surface 141 and the image-side surface 142 beingboth aspheric. Furthermore, each of the object-side surface 141 and theimage-side surface 142 of the fourth lens element 140 includes at leastone inflection point.

The fifth lens element 150 with positive refractive power has anobject-side surface 151 being concave and an image-side surface 152being convex. The fifth lens element 150 is made of a plastic material,and has the object-side surface 151 and the image-side surface 152 beingboth aspheric. Furthermore, the image-side surface 152 of the fifth lenselement 150 includes at least one inflection point.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being convex and an image-side surface 162 beingconcave. The sixth lens element 160 is made of a plastic material, andhas the object-side surface 161 and the image-side surface 162 beingboth aspheric. Furthermore, each of the object-side surface 161 and theimage-side surface 162 of the sixth lens element 160 includes at leastone inflection point.

The seventh lens element 170 with positive refractive power has anobject-side surface 171 being convex and an image-side surface 172 beingconcave. The seventh lens element 170 is made of a plastic material, andhas the object-side surface 171 and the image-side surface 172 beingboth aspheric. Furthermore, each of the object-side surface 171 and theimage-side surface 172 of the seventh lens element 170 includes at leastone inflection point and at least one critical point (as shown in FIG.28 according to the 9th embodiment).

The eighth lens element 180 with negative refractive power has anobject-side surface 181 being concave and an image-side surface 182being concave. The eighth lens element 180 is made of a plasticmaterial, and has the object-side surface 181 and the image-side surface182 being both aspheric. Furthermore, each of the object-side surface181 and the image-side surface 182 of the eighth lens element 180includes at least one inflection point and at least one critical point(as shown in FIG. 28 according to the 9th embodiment).

The filter 190 is made of a glass material and located between theeighth lens element 180 and the image surface 195, and will not affectthe focal length of the image capturing optical assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}\text{/}R} \right)\text{/}\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y\text{/}R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}\; {\left( {A\; i} \right) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from the optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient.

In the image capturing optical assembly according to the 1st embodiment,when a focal length of the image capturing optical assembly is f, anf-number of the image capturing optical assembly is Fno, and half of amaximum field of view of the image capturing optical assembly is HFOV,these parameters have the following values: f=3.94 mm; Fno=1.60; andHFOV=38.6 degrees.

In the image capturing optical assembly according to the 1st embodiment,when a maximum of refractive indexes of all the lens elements (that is,the first lens element 110, the second lens element 120, the third lenselement 130, the fourth lens element 140, the fifth lens element 150,the sixth lens element 160, the seventh lens element 170, and the eighthlens element 180) of the image capturing optical assembly is Nmax (inthe 1st embodiment, which are the second lens element 120, the fourthlens element 140, and the sixth lens element 160), and a minimum ofrefractive indexes of all the lens elements of the image capturingoptical assembly is Nmin (in the 1st embodiment, which is the eighthlens element 180), the following conditions are satisfied: Nmax=1.671;and Nmin=1.535.

In the image capturing optical assembly according to the 1st embodiment,when an Abbe number of the first lens element 110 is V1, an Abbe numberof the second lens element 120 is V2, an Abbe number of the third lenselement 130 is V3, an Abbe number of the fourth lens element 140 is V4,an Abbe number of the fifth lens element 150 is V5, and an Abbe numberof the sixth lens element is V6, the following conditions are satisfied:(V2+V6)/V1=0.70; |(V2−V3)/(V4−V5)|=1.00; and (V4+V5+V6)/V1=1.70.

In the image capturing optical assembly according to the 1st embodiment,when an axial distance between the first lens element 110 and the secondlens element 120 is T12, an axial distance between the second lenselement 120 and the third lens element 130 is T23, an axial distancebetween the third lens element 130 and the fourth lens element 140 isT34, an axial distance between the fourth lens element 140 and the fifthlens element 150 is T45, an axial distance between the fifth lenselement 150 and the sixth lens element 160 is T56, an axial distancebetween the sixth lens element 160 and the seventh lens element 170 isT67, an axial distance between the seventh lens element 170 and theeighth lens element 180 is T78, a maximum of axial distances betweenevery adjacent lens elements of the image capturing optical assembly isATmax (that is, the maximum among T12, T23, T34, T45, T56, T67 and T78),a central thickness of the first lens element 110 is CT1, a centralthickness of the second lens element 120 is CT2, a central thickness ofthe third lens element 130 is CT3, a central thickness of the fourthlens element 140 is CT4, a central thickness of the fifth lens element150 is CT5, a central thickness of the sixth lens element 160 is CT6, acentral thickness of the seventh lens element 170 is CT7, a centralthickness of the eighth lens element 180 is CT8, a minimum of centralthicknesses of all the lens elements of the image capturing opticalassembly is CTmin (that is, the minimum among CT1, CT2, CT3, CT4, CT5,CT6, CT7 and CT8), and a maximum image height of the image capturingoptical assembly is ImgH (half of a diagonal length of an effectivephotosensitive area of the image sensor 196), the following conditionsare satisfied: ATmax/CTmin=2.06; and ATmax/ImgH=0.13.

In the image capturing optical assembly according to the 1st embodiment,when a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, and a curvature radius of the image-side surface 162of the sixth lens element 160 is R12, the following condition issatisfied: (R11−R12)/(R11+R12)=0.29.

In the image capturing optical assembly according to the 1st embodiment,when the focal length of the image capturing optical assembly is f, anda curvature radius of the image-side surface 182 of the eighth lenselement 180 is R16, the following condition is satisfied: f/R16=0.22.

FIG. 27 is a schematic view of parameters (including TL and BL) of the1st embodiment of the present disclosure. In the image capturing opticalassembly and FIG. 27 according to the 1st embodiment, when an entrancepupil diameter of the image capturing optical assembly is EPD, a sum ofcentral thicknesses of all the lens elements of the image capturingoptical assembly is ΣCT (ΣCT=CT1+CT2+CT3+CT4+CT5+CT6+CT7+CT8), an axialdistance between the image-side surface 182 of the eighth lens element180 and the image surface 195 is BL, an axial distance between theobject-side surface 111 of the first lens element 110 and the imagesurface 195 is TL, the focal length of the image capturing opticalassembly is f, the following conditions are satisfied: EPD/ΣCT=0.80;EPD/BL=5.63; TUEPD=2.11; and f/EPD=1.60.

In the image capturing optical assembly according to the 1st embodiment,when the focal length of the image capturing optical assembly is f, afocal length of the first lens element 110 is f1, and a focal length ofthe second lens element 120 is f2, the following conditions aresatisfied: f1/f2=−0.68; and f/f2=−0.37.

In the image capturing optical assembly according to the 1st embodiment,when the focal length of the image capturing optical assembly is f, thefocal length of the first lens element 110 is f1, the focal length ofthe second lens element 120 is f2, a focal length of the third lenselement 130 is f3, a focal length of the fourth lens element 140 is f4,a focal length of the fifth lens element 150 is f5, a focal length ofthe sixth lens element 160 is f6, a focal length of the seventh lenselement 170 is f7, a focal length of the eighth lens element 180 is f8,a focal length of i-th lens element is fi, and a maximum of |f/fi| is|f/fi|max, the following condition is satisfied: |f/fi|max=0.93, whereini=1˜8. (that is, |f/fi|max is a maximum absolute value of a ratiobetween the focal length of the image capturing optical assembly and thefocal length of each lens element, and in the 1st embodiment,|f/fi|max=|f/f5|).

In the image capturing optical assembly according to the 1st embodiment,when the focal length of the image capturing optical assembly is f, thefocal length of the second lens element 120 is f2, and the focal lengthof the third lens element 130 is f3, the following condition issatisfied: (f/f2)+(f/f3)=0.36.

In the image capturing optical assembly and FIG. 27 according to the 1stembodiment, when a central thickness of the filter 190 is CTf, thefollowing condition is satisfied: CTf=0.10 mm.

In the image capturing optical assembly according to the 1st embodiment,when the axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 195 is TL, the focal length ofthe image capturing optical assembly is f, the maximum image height ofthe image capturing optical assembly is ImgH, the following conditionsare satisfied: TL=5.19 mm; TL/f=1.32; and TL/ImgH=1.60.

In the image capturing optical assembly according to the 1st embodiment,when an axial distance between the aperture stop 100 and the image-sidesurface 182 of the eighth lens element 180 is SD, and an axial distancebetween the object-side surface 111 of the first lens element 110 andthe image-side surface 182 of the eighth lens element 180 is TD, thefollowing condition is satisfied: SD/TD=0.87.

In the image capturing optical assembly and FIG. 27 according to the 1stembodiment, when a maximum optical effective radius of the object-sidesurface 111 of the first lens element 110 is Y11, and a maximum opticaleffective radius of the image-side surface 182 of the eighth lenselement 180 is Y82, the following condition is satisfied: Y11/Y82=0.45.

In the image capturing optical assembly according to the 1st embodiment,when half of a maximum field of view of the image capturing opticalassembly is HFOV, the focal length of the image capturing opticalassembly is f, and the entrance pupil diameter of the image capturingoptical assembly is EPD, the following condition is satisfied:HFOV×EPD/f=24.11.

In the image capturing optical assembly according to the 1st embodiment,when the axial distance between the object-side surface 111 of the firstlens element 110 and the image surface 195 is TL, the maximum imageheight of the image capturing optical assembly is ImgH, the focal lengthof the image capturing optical assembly is f, and the entrance pupildiameter of the image capturing optical assembly is EPD, the followingconditions are satisfied: TL/ImgH+f/EPD=3.20; and TL{circumflex over( )}2/(ImgH×EPD)=3.37.

In the image capturing optical assembly according to the 1st embodiment,when the focal length of the image capturing optical assembly is f, afocal length of the first lens group is fG1, a focal length of thesecond lens group is fG2, and a focal length of the third lens group isfG3, the following conditions are satisfied: f/fG1=0.25; f/fG2=1.20; andf/fG3=−1.16. Thus, in the 1st embodiment, the first lens group ispositive refractive power, the second lens group is positive refractivepower, and the third lens group is negative refractive power.

FIG. 28 is a schematic view of critical points and parameters Yc71,Yc72, Yc81 and Yc82 according to the 9th embodiment, wherein thecritical points and the corresponding parameters according to othersembodiments can refer to FIG. 28, and will not be drawn again. In theimage capturing optical assembly according to the 1st embodiment, eachof the object-side surface 171 and the image-side surface 172 of theseventh lens element 170 includes at least one critical point CP71, CP72(as shown in FIG. 28), the image-side surface 182 of the eighth lenselement 180 includes at least one critical point CP82, wherein when avertical distance of the critical point CP71 on the object-side surface171 of the seventh lens element 170 and an optical axis is Yc71, avertical distance of the critical point CP72 on the image-side surface172 of the seventh lens element 170 and the optical axis is Yc72, and avertical distance of the critical point CP82 on the image-side surface182 of the eighth lens element 180 and the optical axis is Yc82, thefollowing conditions are satisfied: Yc71/f=0.23; Yc72/f=0.24; andYc82/f=0.07, 0.29, 0.38 (three critical points including CP82 on theimage-side surface 182 of the eighth lens element 180 in order from theoptical axis to an off-axis region thereof).

In the image capturing optical assembly according to the 1st embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 110 through the eighthlens element 180 is stated in the following table, wherein a curvatureradius of the object-side surface 111 of the first lens element 110 isR1, a curvature radius of the image-side surface 112 of the first lenselement 110 is R2, a curvature radius of the object-side surface 121 ofthe second lens element 120 is R3, a curvature radius of the image-sidesurface 122 of the second lens element 120 is R4, a curvature radius ofthe object-side surface 131 of the third lens element 130 is R5, acurvature radius of the image-side surface 132 of the third lens element130 is R6, a curvature radius of the object-side surface 141 of thefourth lens element 140 is R7, a curvature radius of the image-sidesurface 142 of the fourth lens element 140 is R8, a curvature radius ofthe object-side surface 151 of the fifth lens element 150 is R9, acurvature radius of the image-side surface 152 of the fifth lens element150 is R10, the curvature radius of the object-side surface 161 of thesixth lens element 160 is R11, the curvature radius of the image-sidesurface 162 of the sixth lens element 160 is R12, a curvature radius ofthe object-side surface 171 of the seventh lens element 170 is R13, acurvature radius of the image-side surface 172 of the seventh lenselement 170 is R14, a curvature radius of the object-side surface 181 ofthe eighth lens element 180 is R15, the curvature radius of theimage-side surface 182 of the eighth lens element 180 is R16.

1st Embodiment |f/Rf| + |f/R1| + |f/R2| 3.18 |f/Rf| + |f/R9| + |f/R10|3.33 |f/Rr| |f/R3| + |f/R4| 3.77 |f/Rr| |f/R11| + |f/R12| 2.54 |f/R5| +|f/R6| 2.72 |f/R13| + |f/R14| 4.69 |f/R7| + |f/R8| 0.44 |f/R15| +|f/R16| 1.61

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 3.94 mm, Fno = 1.60, HFOV = 38.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.928 ASP 0.525 Plastic 1.545 56.0 7.10 23.478 ASP 0.081 3 Ape. Stop Plano 0.068 4 Lens 2 2.506 ASP 0.200 Plastic1.671 19.5 −10.52 5 1.790 ASP 0.116 6 Lens 3 1.963 ASP 0.446 Plastic1.544 56.0 5.36 7 5.527 ASP 0.056 8 Stop Plano 0.354 9 Lens 4 186.578ASP 0.262 Plastic 1.671 19.5 −14.96 10 9.516 ASP 0.118 11 Lens 5 −4.540ASP 0.584 Plastic 1.544 56.0 4.24 12 −1.600 ASP 0.080 13 Lens 6 4.352ASP 0.345 Plastic 1.671 19.5 −8.65 14 2.408 ASP 0.412 15 Lens 7 1.619ASP 0.346 Plastic 1.544 56.0 20.86 16 1.746 ASP 0.388 17 Lens 8 −2.844ASP 0.369 Plastic 1.535 55.8 −4.56 18 17.810 ASP 0.230 19 Filter Plano0.100 Glass 1.517 64.2 — 20 Plano 0.107 21 Image Plano — Referencewavelength is 587.6 nm (d-line). Effective radius of the stop on Surface8 is 1.200 mm.

TABLE 2 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −7.5558E−02  1.8388E−01 −2.6199E+01 −1.2691E+01 −7.7466E+00 7.7477E+00 A4=1.9730E−03 −5.9360E−02 −6.8861E−03 −1.7037E−02 −9.3162E−03 −3.1641E−02 A6= −1.5553E−02   3.7091E−02  4.0560E−03  7.8752E−02  7.6992E−029.5138E−04 A8= 5.9626E−03 −7.6079E−02 −4.7529E−02 −1.5539E−01−1.5110E−01 −1.1970E−02  A10= 2.7832E−03  4.5418E−02  3.8138E−02 1.4312E−01  1.3120E−01 1.3892E−03 A12= −9.8246E−03  −9.5835E−03 5.1832E−03 −5.8462E−02 −8.1055E−02 −1.3668E−02  A14= 2.6039E−03−5.6365E−03  1.1309E−02  2.4939E−02 6.9141E−03 A16= A18= Surface # 9 1011 12 13 14 k=  9.0000E+01  4.6461E+01 8.9348E+00 −1.4561E+00 2.4347E+00−6.0993E+00 A4= −2.2585E−01 −3.3182E−01 −2.1600E−01   1.6542E−011.1748E−01 −6.9686E−02 A6=  3.4023E−01  9.4694E−01 1.2471E+00−1.4906E−01 −2.5447E−01   7.9880E−02 A8= −8.9321E−01 −2.0248E+00−2.6063E+00   3.8163E−02 2.6251E−01 −8.2540E−02 A10=  1.2667E+00 2.2813E+00 2.8342E+00  1.8765E−02 −2.1190E−01   3.8046E−02 A12=−9.2388E−01 −1.3710E+00 −1.7268E+00  −1.5067E−02 1.1213E−01 −8.7322E−03A14=  3.1985E−01  4.1316E−01 5.8535E−01  4.5369E−03 −3.5496E−02  9.0885E−04 A16= −4.0070E−02 −4.8397E−02 −1.0137E−01  −6.0201E−045.9114E−03 −2.7497E−05 A18= −1.5452E−04 6.8673E−03 −3.8549E−04  A20 =Surface # 15 16 17 18 k= −4.1418E+00 −3.2044E+00 −1.4099E+01 −6.9116E+01A4= −1.3863E−01 −1.9790E−01 −3.3084E−01 −2.0709E−01 A6=  7.9691E−02 1.6085E−01  5.0767E−01  2.5648E−01 A8= −1.6087E−01 −1.9432E−01−3.9883E−01 −1.4720E−01 A10=  1.3947E−01  1.4107E−01  1.8861E−01 4.7769E−02 A12= −6.0268E−02 −5.5445E−02 −5.5035E−02 −9.5115E−03 A14= 1.4826E−02  1.2492E−02  9.9004E−03  1.1905E−03 A16= −2.1253E−03−1.6295E−03 −1.0681E−03 −9.1817E−05 A18=  1.6577E−04  1.1495E−04 6.3408E−05  4.0079E−06 A20= −5.4420E−06 −3.4029E−06 −1.5944E−06−7.6158E−08

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-21 represent the surfacessequentially arranged from the object side to the image side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A20 represent the asphericcoefficients ranging from the 4th order to the 20th order. The tablespresented below for each embodiment correspond to schematic parameterand aberration curves of each embodiment, and term definitions of thetables are the same as those in Table 1 and Table 2 of the 1stembodiment. Therefore, an explanation in this regard will not beprovided again.

Furthermore, in the 1st embodiment, each of three of the first lenselement 110, the second lens element 120, the third lens element 130,the fourth lens element 140, the fifth lens element 150, the sixth lenselement 160, the seventh lens element 170, and the eighth lens element180 has the Abbe number smaller than 24.0, 23.0 and 20; in detail, thethree lens elements are the second lens element 120, the fourth lenselement 140 and the sixth lens element 160.

In the 1st embodiment, the counts of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element110, the second lens element 120, the third lens element 130, the fourthlens element 140, the fifth lens element 150, the sixth lens element160, the seventh lens element 170, and the eighth lens element 180 arelisted in the table below. Also, in the 1st embodiment, a total numberof inflection points on the object-side surfaces and the image-sidesurfaces of all the lens elements of the image capturing opticalassembly is Ninf., the following condition is satisfied: Ninf.=30.

1st Embodiment - numbers of the inflection points 110 120 130 140 150160 170 180 Object-side 1 2 2 1 0 2 3 3 surface Image-side 1 0 1 2 2 2 35 surface

2nd Embodiment

FIG. 3 is a schematic view of an imaging apparatus according to the 2ndembodiment of the present disclosure. FIG. 4 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 2nd embodiment. In FIG. 3, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 296. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 200, a first lens element 210, a second lens element 220,a third lens element 230, a stop 201, a fourth lens element 240, a fifthlens element 250, a sixth lens element 260, a seventh lens element 270,an eighth lens element 280, a filter 290 and an image surface 295,wherein the image sensor 296 is disposed on the image surface 295 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (210, 220, 230, 240, 250, 260, 270, and280) without additional one or more lens elements inserted between thefirst lens element 210 and the eighth lens element 280, and there is anair gap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 210 and thesecond lens element 220 belong to a first lens group (its referencenumeral is omitted). The third lens element 230, the fourth lens element240 and the fifth lens element 250 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 260, the seventhlens element 270 and the eighth lens element 280 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex and an image-side surface 212 beingconcave. The first lens element 210 is made of a plastic material, andhas the object-side surface 211 and the image-side surface 212 beingboth aspheric. Furthermore, each of the object-side surface 211 and theimage-side surface 212 of the first lens element 210 includes at leastone inflection point.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex and an image-side surface 222 beingconcave. The second lens element 220 is made of a plastic material, andhas the object-side surface 221 and the image-side surface 222 beingboth aspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex and an image-side surface 232 beingconcave. The third lens element 230 is made of a plastic material, andhas the object-side surface 231 and the image-side surface 232 beingboth aspheric. Furthermore, each of the object-side surface 231 and theimage-side surface 232 of the third lens element 230 includes at leastone inflection point.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave and an image-side surface 242being concave. The fourth lens element 240 is made of a plasticmaterial, and has the object-side surface 241 and the image-side surface242 being both aspheric. Furthermore, the image-side surface 242 of thefourth lens element 240 includes at least one inflection point.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being concave and an image-side surface 252being convex. The fifth lens element 250 is made of a plastic material,and has the object-side surface 251 and the image-side surface 252 beingboth aspheric. Furthermore, the image-side surface 252 of the fifth lenselement 250 includes at least one inflection point.

The sixth lens element 260 with positive refractive power has anobject-side surface 261 being convex and an image-side surface 262 beingconvex. The sixth lens element 260 is made of a plastic material, andhas the object-side surface 261 and the image-side surface 262 beingboth aspheric. Furthermore, each of the object-side surface 261 and theimage-side surface 262 of the sixth lens element 260 includes at leastone inflection point.

The seventh lens element 270 with negative refractive power has anobject-side surface 271 being convex and an image-side surface 272 beingconcave. The seventh lens element 270 is made of a plastic material, andhas the object-side surface 271 and the image-side surface 272 beingboth aspheric. Furthermore, each of the object-side surface 271 and theimage-side surface 272 of the seventh lens element 270 includes at leastone inflection point and at least one critical point.

The eighth lens element 280 with negative refractive power has anobject-side surface 281 being concave and an image-side surface 282being convex. The eighth lens element 280 is made of a plastic material,and has the object-side surface 281 and the image-side surface 282 beingboth aspheric. Furthermore, each of the object-side surface 281 and theimage-side surface 282 of the eighth lens element 280 includes at leastone inflection point, and the object-side surface 281 of the eighth lenselement 280 includes at least one critical point.

The filter 290 is made of a glass material and located between theeighth lens element 280 and the image surface 295, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 3.86 mm, Fno = 1.47, HFOV = 39.2 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.358  2 Lens 1 1.873 ASP 0.521Plastic 1.545 56.0 7.20 3 3.234 ASP 0.082 4 Lens 2 2.316 ASP 0.202Plastic 1.671 19.5 −12.72 5 1.758 ASP 0.160 6 Lens 3 2.045 ASP 0.503Plastic 1.544 56.0 5.16 7 6.865 ASP 0.048 8 Stop Plano 0.339 9 Lens 4−32.701 ASP 0.260 Plastic 1.671 19.5 −11.27 10 9.863 ASP 0.085 11 Lens 5−4.301 ASP 0.484 Plastic 1.544 56.0 5.13 12 −1.760 ASP 0.075 13 Lens 6112.292 ASP 0.364 Plastic 1.671 19.5 27.69 14 −22.222 ASP 0.423 15 Lens7 1.902 ASP 0.340 Plastic 1.544 56.0 −5.82 16 1.113 ASP 0.359 17 Lens 8−6.996 ASP 0.350 Plastic 1.544 56.0 −13.92 18 −93.135 ASP 0.250 19Filter Plano 0.100 Glass 1.517 64.2 — 20 Plano 0.108 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 8 is 1.140 mm.

TABLE 4 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.3524E−01 5.3969E−01 −1.9953E+01 −9.9928E+00 −9.4801E+00   9.3170E+00 A4=−1.3031E−04 −4.2969E−02  2.0893E−02 −1.7829E−03 4.9091E−02 −2.7703E−02A6=  1.5256E−03 −7.5619E−02 −1.8379E−01 −7.7109E−02 −1.0889E−01 −2.4663E−02 A8= −2.9479E−02  7.5476E−02  3.0327E−01  1.8403E−011.1772E−01 −7.6394E−03 A10=  3.1224E−02 −3.4856E−02 −2.1831E−01−1.2731E−01 −8.7029E−02  −1.2633E−02 A12= −2.1644E−02  5.3303E−03 8.8695E−02  3.6808E−02 2.0446E−02  9.7559E−03 A14=  4.6368E−03−1.5980E−02 −1.0098E−04 5.4879E−03 −9.8383E−04 A16= −6.3288E−14 A18=Surface # 9 10 11 12 13 14 k=  9.0000E+01 5.1627E+01 9.3342E+00−9.6236E−01 6.0000E+00 −9.0000E+01 A4= −2.0881E−01 −3.3392E−01 −2.0264E−01   1.5810E−01 2.3064E−01  9.5980E−02 A6=  9.0250E−029.3714E−01 1.3512E+00 −3.6216E−01 −6.1552E−01  −2.0040E−01 A8=−2.3290E−01 −2.0276E+00  −2.9796E+00   4.6587E−01 7.3141E−01  1.4810E−01A10=  3.0447E−01 2.2804E+00 3.4675E+00 −3.3558E−01 −5.9386E−01 −7.0380E−02 A12= −1.4061E−01 −1.3713E+00  −2.3369E+00   1.3221E−013.2191E−01  2.0538E−02 A14= −6.9724E−03 4.1305E−01 9.1943E−01−2.4771E−02 −1.1329E−01  −3.1945E−03 A16=  1.5001E−02 −4.8314E−02 −2.0171E−01   1.4573E−03 2.3359E−02  2.0064E−04 A18= 9.8183E−062.0189E−02 −2.0940E−03  A20= Surface # 15 16 17 18 k= −7.2554E+00−3.7601E+00 −6.7960E+01  9.0000E+01 A4= −2.7196E−01 −2.1167E−01−5.3883E−02 −5.4065E−02 A6=  1.5314E−01  1.5311E−01  7.3396E−02 6.1904E−02 A8= −7.0242E−02 −8.9515E−02 −5.9767E−02 −3.4069E−02 A10= 2.1630E−02  3.6277E−02  2.8548E−02  1.1055E−02 A12= −1.5091E−03−9.4600E−03 −8.3072E−03 −2.3126E−03 A14= −1.2865E−03  1.5354E−03 1.4891E−03  3.1694E−04 A16=  4.3817E−04 −1.4866E−04 −1.6026E−04−2.7500E−05 A18= −5.6988E−05  7.7983E−06  9.4940E−06  1.3682E−06 A20= 2.7666E−06 −1.6911E−07 −2.3800E−07 −2.9670E−08

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment, and the object-side surface 281 of the eighth lens element280 includes at least one critical point CP81 (as shown in FIG. 28), anda vertical distance of the critical point CP81 on the object-sidesurface 281 of the eighth lens element 280 and the optical axis is Yc81.Also, the definitions of these parameters shown in the following tableare the same as those stated in the 1st embodiment with correspondingvalues for the 2nd embodiment, so an explanation in this regard will notbe provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 3.86 |f/fi|max 0.75 Fno 1.47 (f/f2) + (f/f3) 0.44HFOV [deg.] 39.2 CTf [mm] 0.10 Nmax 1.671 TL [mm] 5.05 Nmin 1.544 TL/f1.31 (V2 + V6)V/1 0.70 TL/ImgH 1.55 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.92 (V4 + V5 + V6)/V1 1.70 Y11/Y82 0.45 ATmax/CTmin 2.09 HFOV × EPD/f26.65 ATmax/ImgH 0.13 TL/ImgH + f/EPD 3.02 (R11 − R12)/(R11 + R12) 1.49TL{circumflex over ( )}2/(ImgH × EPD) 2.99 f/R16 −0.04 f/fG1 0.29EPD/ΣCT 0.87 f/fG2 1.03 EPD/BL 5.73 f/fG3 −0.76 TL/EPD 1.92 Yc71/f 0.19f/EPD 1.47 Yc72/f 0.31 f1/f2 −0.57 Yc81/f 0.68 f/f2 −0.30 Yc82/f —

In the image capturing optical assembly according to the 2nd embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 210 through the eighthlens element 280 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment |f/Rf| + |f/Rr| |f/R1| + |f/R2| 3.26 |f/Rf| + |f/Rr| |f/R9| + |f/R10| 3.09 |f/R3| + |f/R4| 3.87 |f/R11| + |f/R12| 0.21|f/R5| + |f/R6| 2.45 |f/R13| + |f/R14| 5.50 |f/R7| + |f/R8| 0.51|f/R15| + |f/R16| 0.59

In the 2nd embodiment, each of three of the first lens element 210, thesecond lens element 220, the third lens element 230, the fourth lenselement 240, the fifth lens element 250, the sixth lens element 260, theseventh lens element 270, and the eighth lens element 280 has an Abbenumber smaller than 24.0, 23.0 and 20; in detail, the three lenselements are the second lens element 220, the fourth lens element 240and the sixth lens element 260.

In the 2nd embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element210, the second lens element 220, the third lens element 230, the fourthlens element 240, the fifth lens element 250, the sixth lens element260, the seventh lens element 270, and the eighth lens element 280 arelisted in the table below. Moreover, in the 2nd embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=22.

2nd Embodiment - numbers of the inflection points 210 220 230 240 250260 270 280 Object-side 1 0 2 0 0 2 3 1 surface Image-side 1 0 1 2 2 3 13 surface

3rd Embodiment

FIG. 5 is a schematic view of an imaging apparatus according to the 3rdembodiment of the present disclosure. FIG. 6 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 3rd embodiment. In FIG. 5, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 396. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 300, a first lens element 310, a second lens element 320,a third lens element 330, a stop 301, a fourth lens element 340, a fifthlens element 350, a sixth lens element 360, a seventh lens element 370,an eighth lens element 380, a filter 390 and an image surface 395,wherein the image sensor 396 is disposed on the image surface 395 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (310, 320, 330, 340, 350, 360, 370 and 380)without additional one or more lens elements inserted between the firstlens element 310 and the eighth lens element 380, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 310 and thesecond lens element 320 belong to a first lens group (its referencenumeral is omitted). The third lens element 330, the fourth lens element340 and the fifth lens element 350 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 360, the seventhlens element 370 and the eighth lens element 380 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 310 with negative refractive power has anobject-side surface 311 being convex and an image-side surface 312 beingconcave. The first lens element 310 is made of a plastic material, andhas the object-side surface 311 and the image-side surface 312 beingboth aspheric. Furthermore, each of the object-side surface 311 and theimage-side surface 312 of the first lens element 310 includes at leastone inflection point.

The second lens element 320 with positive refractive power has anobject-side surface 321 being convex and an image-side surface 322 beingconcave. The second lens element 320 is made of a plastic material, andhas the object-side surface 321 and the image-side surface 322 beingboth aspheric. Furthermore, the object-side surface 321 of the secondlens element 320 includes at least one inflection point.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex and an image-side surface 332 beingconcave. The third lens element 330 is made of a plastic material, andhas the object-side surface 331 and the image-side surface 332 beingboth aspheric. Furthermore, each of the object-side surface 331 and theimage-side surface 332 of the third lens element 330 includes at leastone inflection point.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave and an image-side surface 342being concave. The fourth lens element 340 is made of a plasticmaterial, and has the object-side surface 341 and the image-side surface342 being both aspheric. Furthermore, the image-side surface 342 of thefourth lens element 340 includes at least one inflection point.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being concave and an image-side surface 352being convex. The fifth lens element 350 is made of a plastic material,and has the object-side surface 351 and the image-side surface 352 beingboth aspheric. Furthermore, each of the object-side surface 351 and theimage-side surface 352 of the fifth lens element 350 includes at leastone inflection point.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being concave and an image-side surface 362being convex. The sixth lens element 360 is made of a plastic material,and has the object-side surface 361 and the image-side surface 362 beingboth aspheric. Furthermore, each of the object-side surface 361 and theimage-side surface 362 of the sixth lens element 360 includes at leastone inflection point.

The seventh lens element 370 with negative refractive power has anobject-side surface 371 being convex and an image-side surface 372 beingconcave. The seventh lens element 370 is made of a plastic material, andhas the object-side surface 371 and the image-side surface 372 beingboth aspheric. Furthermore, each of the object-side surface 371 and theimage-side surface 372 of the seventh lens element 370 includes at leastone inflection point and at least one critical point.

The eighth lens element 380 with negative refractive power has anobject-side surface 381 being concave and an image-side surface 382being convex. The eighth lens element 380 is made of a plastic material,and has the object-side surface 381 and the image-side surface 382 beingboth aspheric. Furthermore, each of the object-side surface 381 and theimage-side surface 382 of the eighth lens element 380 includes at leastone inflection point, and the object-side surface 381 of the eighth lenselement 380 includes at least one critical point.

The filter 390 is made of a glass material and located between theeighth lens element 380 and the image surface 395, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 3.74 mm, Fno = 1.61, HFOV = 40.5 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.274 2 Lens 1 1.923 ASP 0.298Plastic 1.545 56.0 −16.39 3 1.496 ASP 0.031 4 Lens 2 1.361 ASP 0.350Plastic 1.563 40.2 7.50 5 1.821 ASP 0.149 6 Lens 3 2.203 ASP 0.626Plastic 1.544 56.0 4.48 7 20.603 ASP −0.027 8 Stop Plano 0.361 9 Lens 4−22.168 ASP 0.275 Plastic 1.671 19.5 −9.98 10 9.642 ASP 0.068 11 Lens 5−4.407 ASP 0.591 Plastic 1.544 56.0 4.39 12 −1.623 ASP 0.130 13 Lens 6−30.186 ASP 0.530 Plastic 1.634 23.8 −101.86 14 −57.067 ASP 0.154 15Lens 7 1.309 ASP 0.340 Plastic 1.544 56.0 −5.93 16 0.846 ASP 0.459 17Lens 8 −9.072 ASP 0.386 Plastic 1.634 23.8 −19.31 18 −35.602 ASP 0.20019 Filter Plano 0.130 Glass 1.517 64.2 — 20 Plano 0.096 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 8 is 1.140 mm.

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −4.4711E−01−9.5520E+00 −8.8928E+00 −5.2239E+00  −9.5073E+00  −9.0000E+01 A4=−6.2411E−03 −5.3786E−02 −1.0592E−02 4.5871E−03 6.5584E−02 −4.2459E−02A6=  3.1219E−03 −6.1056E−02 −2.0198E−01 −8.3385E−02  −1.0522E−01 −2.1599E−02 A8= −2.5195E−02  7.6895E−02  3.1050E−01 1.7485E−011.1659E−01 −9.1196E−03 A10=  2.7154E−02 −3.5577E−02 −2.1142E−01−1.3155E−01  −8.8028E−02  −1.3989E−02 A12= −2.5929E−02  2.0846E−03 8.7687E−02 3.8302E−02 1.9616E−02  9.6094E−03 A14=  5.7225E−03−1.8830E−02 1.3277E−03 5.4868E−03 −6.1683E−04 A16=  3.0034E−04 A18=Surface # 9 10 11 12 13 14 k=  9.0000E+01  5.0373E+01 9.1156E+00−1.0068E+00 −9.0000E+01 9.0000E+01 A4= −2.2912E−01 −3.0905E−01−1.5236E−01   1.2765E−01  2.6324E−01 9.6277E−02 A6=  8.7969E−02 9.4355E−01 1.2374E+00 −2.6929E−01 −6.1361E−01 −2.0033E−01  A8=−2.2787E−01 −2.0254E+00 −2.7866E+00   3.0824E−01  7.3099E−01 1.4810E−01A10=  3.0765E−01  2.2810E+00 3.2946E+00 −1.8311E−01 −5.9413E−01−7.0379E−02  A12= −1.3976E−01 −1.3713E+00 −2.2644E+00   4.8836E−02 3.2181E−01 2.0538E−02 A14= −7.1045E−03  4.1296E−01 9.2161E−01 4.4097E−04 −1.1332E−01 −3.1945E−03  A16=  1.4718E−02 −4.8416E−02−2.1306E−01  −1.8066E−03  2.3346E−02 2.0063E−04 A18= −6.8119E−052.2712E−02 −2.0982E−03 A20= Surface # 15 16 17 18 k= −9.0340E+00−4.5314E+00 −4.6817E+01  8.9989E+01 A4= −2.8958E−01 −2.1586E−01−1.0636E−01 −6.3608E−02 A6=  1.2538E−01  1.8290E−01  2.1233E−01 1.0398E−01 A8= −6.5132E−02 −1.1576E−01 −1.7389E−01 −6.9913E−02 A10= 4.1765E−02  5.0184E−02  7.4610E−02  2.5189E−02 A12= −1.6299E−02−1.4422E−02 −1.8952E−02 −5.5236E−03 A14=  3.2686E−03  2.7007E−03 2.9771E−03  7.6755E−04 A16= −2.6454E−04 −3.1762E−04 −2.8545E−04−6.6288E−05 A18= −7.2303E−06  2.1317E−05  1.5365E−05  3.2492E−06 A20= 1.7611E−06 −6.2186E−07 −3.5666E−07 −6.9030E−08

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 3rd embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 3.74 |f/fi|max 0.85 Fno 1.61 (f/f2) + (f/f3) 1.33HFOV [deg.] 40.5 CTf [mm] 0.13 Nmax 1.671 TL [mm] 5.15 Nmin 1.544 TL/f1.37 (V2 + V6)/A/1 1.14 TL/ImgH 1.56 |(V2 − V3)/(V4 − V5)| 0.43 SD/TD0.94 (V4 + V5 + V6)/V1 1.77 Y11/Y82 0.39 ATmax/CTmin 1.67 HFOV × EPD/f25.14 ATmax/ImgH 0.14 TL/ImgH + f/EPD 3.17 (R11 − R12)/ −0.31TL{circumflex over ( )}2/(ImgH × EPD) 3.45 (R11 + R12) f/R16 −0.11 f/fG10.23 EPD/ΣCT 0.68 f/fG2 1.13 EPD/BL 5.46 f/fG3 −0.87 TL/EPD 2.21 Yc71/f0.18 f/EPD 1.61 Yc72/f 0.35 f1/f2 −2.18 Yc81/f 0.72\0.75 f/f2 0.50Yc82/f —

In the image capturing optical assembly according to the 3rd embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 310 through the eighthlens element 380 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

3rd Embodiment |f/Rf| + |f/R1| + |f/R2| 4.45 |f/Rf| + |f/R9| + |f/R10|3.16 |f/Rr| |f/R3| + |f/R4| 4.81 |f/Rr| |f/R11| + |f/R12| 0.19 |f/R5| +|f/R6| 1.88 |f/R13| + |f/R14| 7.28 |f/R7| + |f/R8| 0.56 |f/R15| +|f/R16| 0.52

In the 3rd embodiment, each of three of the first lens element 310, thesecond lens element 320, the third lens element 330, the fourth lenselement 340, the fifth lens element 350, the sixth lens element 360, theseventh lens element 370, and the eighth lens element 380 has an Abbenumber smaller than 24.0; in detail, the three lens elements are thefourth lens element 340, the sixth lens element 360 and the eighth lenselement 380.

In the 3rd embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element310, the second lens element 320, the third lens element 330, the fourthlens element 340, the fifth lens element 350, the sixth lens element360, the seventh lens element 370, and the eighth lens element 380 arelisted in the table below. Moreover, in the 3rd embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=32.

3rd Embodiment - numbers of the inflection points 310 320 330 340 350360 370 380 Object-side 1 2 2 0 2 2 3 4 surface Image-side 1 0 1 2 2 3 34 surface

4th Embodiment

FIG. 7 is a schematic view of an imaging apparatus according to the 4thembodiment of the present disclosure. FIG. 8 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 4th embodiment. In FIG. 7, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 496. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 400, a first lens element 410, a second lens element 420,a stop 401, a third lens element 430, a stop 402, a fourth lens element440, a fifth lens element 450, a sixth lens element 460, a seventh lenselement 470, an eighth lens element 480, a filter 490 and an imagesurface 495, wherein the image sensor 496 is disposed on the imagesurface 495 of the image capturing optical assembly. The image capturingoptical assembly includes eight lens elements (410, 420, 430, 440, 450,460, 470 and 480) without additional one or more lens elements insertedbetween the first lens element 410 and the eighth lens element 480, andthere is an air gap in a paraxial region between every adjacent lenselements of the image capturing optical assembly. The first lens element410 and the second lens element 420 belong to a first lens group (itsreference numeral is omitted). The third lens element 430, the fourthlens element 440 and the fifth lens element 450 belong to a second lensgroup (its reference numeral is omitted). The sixth lens element 460,the seventh lens element 470 and the eighth lens element 480 belong to athird lens group (its reference numeral is omitted).

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex and an image-side surface 412 beingconcave. The first lens element 410 is made of a plastic material, andhas the object-side surface 411 and the image-side surface 412 beingboth aspheric. Furthermore, each of the object-side surface 411 and theimage-side surface 412 of the first lens element 410 includes at leastone inflection point.

The second lens element 420 with negative refractive power has anobject-side surface 421 being convex and an image-side surface 422 beingconcave. The second lens element 420 is made of a plastic material, andhas the object-side surface 421 and the image-side surface 422 beingboth aspheric. Furthermore, the object-side surface 421 of the secondlens element 420 includes at least one inflection point.

The third lens element 430 with positive refractive power has anobject-side surface 431 being convex and an image-side surface 432 beingconcave. The third lens element 430 is made of a plastic material, andhas the object-side surface 431 and the image-side surface 432 beingboth aspheric. Furthermore, each of the object-side surface 431 and theimage-side surface 432 of the third lens element 430 includes at leastone inflection point.

The fourth lens element 440 with negative refractive power has anobject-side surface 441 being concave and an image-side surface 442being concave. The fourth lens element 440 is made of a plasticmaterial, and has the object-side surface 441 and the image-side surface442 being both aspheric. Furthermore, the image-side surface 442 of thefourth lens element 440 includes at least one inflection point.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being concave and an image-side surface 452being convex. The fifth lens element 450 is made of a plastic material,and has the object-side surface 451 and the image-side surface 452 beingboth aspheric. Furthermore, each of the object-side surface 451 and theimage-side surface 452 of the fifth lens element 450 includes at leastone inflection point.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being convex and an image-side surface 462 beingconcave. The sixth lens element 460 is made of a plastic material, andhas the object-side surface 461 and the image-side surface 462 beingboth aspheric. Furthermore, each of the object-side surface 461 and theimage-side surface 462 of the sixth lens element 460 includes at leastone inflection point.

The seventh lens element 470 with negative refractive power has anobject-side surface 471 being convex and an image-side surface 472 beingconcave. The seventh lens element 470 is made of a plastic material, andhas the object-side surface 471 and the image-side surface 472 beingboth aspheric. Furthermore, each of the object-side surface 471 and theimage-side surface 472 of the seventh lens element 470 includes at leastone inflection point and at least one critical point.

The eighth lens element 480 with positive refractive power has anobject-side surface 481 being convex and an image-side surface 482 beingconcave. The eighth lens element 480 is made of a plastic material, andhas the object-side surface 481 and the image-side surface 482 beingboth aspheric. Furthermore, each of the object-side surface 481 and theimage-side surface 482 of the eighth lens element 480 includes at leastone inflection point and at least one critical point.

The filter 490 is made of a glass material and located between theeighth lens element 480 and the image surface 495, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 3.76 mm, Fno = 1.37, HFOV = 41.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.402 2 Lens 1 1.834 ASP 0.600Plastic 1.545 56.0 6.58 3 3.324 ASP 0.061 4 Lens 2 2.594 ASP 0.200Plastic 1.669 19.5 −12.27 5 1.910 ASP 0.318 6 Stop Plano −0.173 7 Lens 32.079 ASP 0.455 Plastic 1.544 56.0 5.53 8 6.201 ASP 0.027 9 Stop Plano0.306 10 Lens 4 −184.747 ASP 0.293 Plastic 1.669 19.5 −14.23 11 10.040ASP 0.103 12 Lens 5 −4.300 ASP 0.461 Plastic 1.544 56.0 4.76 13 −1.676ASP 0.030 14 Lens 6 4.442 ASP 0.337 Plastic 1.669 19.5 −22.89 15 3.339ASP 0.395 16 Lens 7 1.656 ASP 0.330 Plastic 1.544 56.0 −5.70 17 1.004ASP 0.282 18 Lens 8 9.927 ASP 0.486 Plastic 1.559 40.4 49.07 19 15.290ASP 0.250 20 Filter Plano 0.130 Glass 1.517 64.2 — 21 Plano 0.162 22Image Plano — Reference wavelength is 587.6 nm (d-line). Effectiveradius of the stop on Surface 6 is 1.170 mm. Effective radius of thestop on Surface 9 is 1.140 mm.

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 7 8 k= −1.4994E−01−3.0847E−01 −3.2415E+01 −1.1928E+01 −8.6888E+00 1.1228E+01 A4=−3.9379E−03 −4.7439E−02 2.0951E−02 −2.0940E−03 4.7306E−02 −2.3296E−02A6= 7.6028E−03 −7.1572E−02 −1.8634E−01 −7.6418E−02 −1.0950E−01−2.3006E−02 A8= −2.8921E−02 7.7995E−02 3.0281E−01 1.8180E−01 1.1636E−01−1.0079E−02 A10= 3.1513E−02 −3.5537E−02 −2.1775E−01 −1.3011E−01−8.9436E−02 −1.3835E−02 A12= −2.1756E−02 5.3177E−03 8.7942E−023.6695E−02 1.9529E−02 1.0141E−02 A14= 4.5414E−03 −1.5308E−02 1.2825E−037.3562E−03 1.7260E−05 Surface # 10 11 12 13 14 15 k= 9.0000E+015.4558E+01 9.4628E+00 −1.5312E+00 8.2651E−01 −8.7226E+00 A4= −1.8393E−01−3.3866E−01 −2.5750E−01 1.5833E−01 2.2654E−01 7.5153E−02 A6= 8.6474E−029.4505E−01 1.4888E+00 −2.9202E−01 −6.1992E−01 −1.9676E−01 A8=−2.3306E−01 −2.0265E+00 −3.0306E+00 3.9288E−01 7.3087E−01 1.4801E−01A10= 3.0473E−01 2.2804E+00 3.2054E+00 −3.5333E−01 −5.9394E−01−7.0417E−02 A12= −1.4098E−01 −1.3714E+00 −1.8605E+00 1.8774E−013.2190E−01 2.0531E−02 A14= −7.1273E−03 4.1304E−01 5.5809E−01 −5.1114E−02−1.1329E−01 −3.1960E−03 A16= 1.5038E−02 −4.8349E−02 −6.7236E−025.4410E−03 2.3358E−02 2.0038E−04 A18= −4.8914E−05 −6.4327E−05−2.0926E−03 A20= Surface # 16 17 18 19 k= −8.0802E+00 −4.4752E+00−1.4265E+01 −2.3285E+00 A4= −3.7733E−01 −2.4447E−01 −1.1097E−02−3.4078E−03 A6= 2.6815E−01 1.8180E−01 7.7766E−04 −3.2668E−04 A8=−2.0928E−01 −1.1536E−01 1.4530E−05 7.4035E−06 A10= 1.3966E−01 5.4032E−023.7315E−07 1.6660E−06 A12= −5.9213E−02 −1.6843E−02 −7.4913E−081.7214E−07 A14= 1.5327E−02 3.3677E−03 −4.5860E−09 1.2438E−08 A16=−2.3800E−03 −4.1600E−04 2.5602E−10 −7.0867E−10 A18= 2.0521E−042.9005E−05 9.6774E−12 −4.5098E−11 A20= −7.6115E−06 −8.7663E−07−2.1212E−12 −3.2136E−12

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 4th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 3.76 |f/fi|max 0.79 Fno 1.37 (f/f2) + (f/f3) 0.37HFOV [deg.] 41.0 CTf [mm] 0.13 Nmax 1.669 TL [mm] 5.05 Nmin 1.544 TL/f1.34 (V2 + V6)/V1 0.70 TL/ImgH 1.47 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.91 (V4 + V5 + V6)/V1 1.70 Y11/Y82 0.43 ATmax/CTmin 1.98 HFOV × EPD/f29.92 ATmax/ImgH 0.11 TL/ImgH + f/EPD 2.84 (R11 − R12)/(R11 + R12) 0.14TL{circumflex over ( )}2/(ImgH × EPD) 2.71 f/R16 0.25 f/fG1 0.33 EPD/ΣCT0.87 f/fG2 1.06 EPD/BL 5.07 f/fG3 −0.77 TL/EPD 1.84 Yc71/f 0.17 f/EPD1.37 Yc72/f 0.28 f1/f2 −0.54 Yc81/f 0.45\0.66 f/f2 −0.31 Yc82/f0.49\0.76

In the image capturing optical assembly according to the 4th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 410 through the eighthlens element 480 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

4th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.18 |f/Rf| + |f/R9| + |f/R10|3.12 |f/Rr| |f/R3| + |f/R4| 3.42 |f/Rr| |f/R11| + |f/R12| 1.97 |f/R5| +|f/R6| 2.42 |f/R13| + |f/R14| 6.02 |f/R7| + |f/R8| 0.40 |f/R15| +|f/R16| 0.63

In the 4th embodiment, each of three of the first lens element 410, thesecond lens element 420, the third lens element 430, the fourth lenselement 440, the fifth lens element 450, the sixth lens element 460, theseventh lens element 470, and the eighth lens element 480 has an Abbenumber smaller than 24.0, 23.0 and 20; in detail, the three lenselements are the second lens element 420, the fourth lens element 440,and the sixth lens element 460.

In the 4th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element410, the second lens element 420, the third lens element 430, the fourthlens element 440, the fifth lens element 450, the sixth lens element460, the seventh lens element 470, and the eighth lens element 480 arelisted in the table below. Moreover, in the 4th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=24.

4th Embodiment—numbers of the inflection points 410 420 430 440 450 460470 480 Object-side 1 2 2 0 2 2 3 2 surface Image-side 1 0 1 2 2 1 1 2surface

5th Embodiment

FIG. 9 is a schematic view of an imaging apparatus according to the 5thembodiment of the present disclosure. FIG. 10 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 5th embodiment. In FIG. 9, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 596. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 500, a first lens element 510, a second lens element 520,a third lens element 530, a stop 501, a fourth lens element 540, a fifthlens element 550, a sixth lens element 560, a seventh lens element 570,an eighth lens element 580, a filter 590 and an image surface 595,wherein the image sensor 596 is disposed on the image surface 595 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (510, 520, 530, 540, 550, 560, 570 and 580)without additional one or more lens elements inserted between the firstlens element 510 and the eighth lens element 580, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 510 and thesecond lens element 520 belong to a first lens group (its referencenumeral is omitted). The third lens element 530, the fourth lens element540 and the fifth lens element 550 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 560, the seventhlens element 570 and the eighth lens element 580 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex and an image-side surface 512 beingconcave. The first lens element 510 is made of a plastic material, andhas the object-side surface 511 and the image-side surface 512 beingboth aspheric. Furthermore, each of the object-side surface 511 and theimage-side surface 512 of the first lens element 510 includes at leastone inflection point.

The second lens element 520 with negative refractive power has anobject-side surface 521 being convex and an image-side surface 522 beingconcave. The second lens element 520 is made of a plastic material, andhas the object-side surface 521 and the image-side surface 522 beingboth aspheric.

The third lens element 530 with positive refractive power has anobject-side surface 531 being convex and an image-side surface 532 beingconcave. The third lens element 530 is made of a plastic material, andhas the object-side surface 531 and the image-side surface 532 beingboth aspheric. Furthermore, each of the object-side surface 531 and theimage-side surface 532 of the third lens element 530 includes at leastone inflection point.

The fourth lens element 540 with negative refractive power has anobject-side surface 541 being convex and an image-side surface 542 beingconcave. The fourth lens element 540 is made of a plastic material, andhas the object-side surface 541 and the image-side surface 542 beingboth aspheric. Furthermore, each of the object-side surface 541 and theimage-side surface 542 of the fourth lens element 540 includes at leastone inflection point.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being concave and an image-side surface 552being convex. The fifth lens element 550 is made of a plastic material,and has the object-side surface 551 and the image-side surface 552 beingboth aspheric. Furthermore, the image-side surface 552 of the fifth lenselement 550 includes at least one inflection point.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being convex and an image-side surface 562 beingconcave. The sixth lens element 560 is made of a plastic material, andhas the object-side surface 561 and the image-side surface 562 beingboth aspheric. Furthermore, each of the object-side surface 561 and theimage-side surface 562 of the sixth lens element 560 includes at leastone inflection point.

The seventh lens element 570 with negative refractive power has anobject-side surface 571 being convex and an image-side surface 572 beingconcave. The seventh lens element 570 is made of a plastic material, andhas the object-side surface 571 and the image-side surface 572 beingboth aspheric. Furthermore, each of the object-side surface 571 and theimage-side surface 572 of the seventh lens element 570 includes at leastone inflection point and at least one critical point.

The eighth lens element 580 with negative refractive power has anobject-side surface 581 being concave and an image-side surface 582being convex. The eighth lens element 580 is made of a plastic material,and has the object-side surface 581 and the image-side surface 582 beingboth aspheric. Furthermore, each of the object-side surface 581 and theimage-side surface 582 of the eighth lens element 580 includes at leastone inflection point, and the image-side surface 582 of the eighth lenselement 580 includes at least one critical point.

The filter 590 is made of a glass material and located between theeighth lens element 580 and the image surface 595, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 4.56 mm, Fno = 1.55, HFOV = 39.2 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.387 2 Lens 1 2.264 ASP 0.642Plastic 1.535 55.8 8.19 3 4.221 ASP 0.048 4 Lens 2 3.153 ASP 0.202Plastic 1.671 19.5 −15.15 5 2.345 ASP 0.208 6 Lens 3 2.440 ASP 0.488Plastic 1.544 56.0 7.18 7 6.044 ASP 0.073 8 Stop Plano 0.420 9 Lens 4528.763 ASP 0.272 Plastic 1.671 19.5 −18.85 10 12.347 ASP 0.172 11 Lens5 −5.075 ASP 0.526 Plastic 1.544 56.0 5.24 12 −1.891 ASP 0.069 13 Lens 65.629 ASP 0.379 Plastic 1.671 19.5 −17.91 14 3.729 ASP 0.634 15 Lens 71.646 ASP 0.378 Plastic 1.530 55.8 −8.36 16 1.105 ASP 0.387 17 Lens 8−59.623 ASP 0.442 Plastic 1.639 23.3 −282.30 18 −89.336 ASP 0.299 19Filter Plano 0.210 Glass 1.517 64.2 — 20 Plano 0.113 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 8 is 1.362 mm.

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.7992E−01−8.7259E−01 −2.6564E+01 −1.2345E+01 −9.2403E+00 6.9357E+00 A4=−2.3168E−03 −2.9017E−02 1.1658E−02 5.5408E−03 3.1431E−02 −9.7482E−03 A6=2.0819E−03 −3.0175E−02 −7.5949E−02 −3.8770E−02 −5.2698E−02 −1.9227E−02A8= −8.8122E−03 2.2261E−02 8.7431E−02 5.0172E−02 2.6249E−02 −5.5651E−03A10= 6.1312E−03 −7.2593E−03 −4.3674E−02 −1.8363E−02 −9.2639E−035.9304E−03 A12= −3.0725E−03 6.4481E−04 1.2358E−02 8.6512E−04 3.8706E−04−2.1474E−03 A14= 4.2969E−04 −1.6039E−03 8.9868E−04 7.4904E−04 1.7616E−04Surface # 9 10 11 12 13 14 k= −2.1585E+01 5.3417E+01 9.3168E+00−1.4348E+00 1.5297E+00 −9.7262E+00 A4= −1.2489E−01 −1.9848E−01−1.6309E−01 7.1684E−02 1.3332E−01 4.3111E−02 A6= 1.5744E−01 3.8749E−015.3201E−01 −8.7810E−02 −2.5453E−01 −8.0934E−02 A8= −3.1779E−01−5.8212E−01 −6.7838E−01 8.0966E−02 2.1012E−01 4.2532E−02 A10= 3.0813E−014.5895E−01 4.6600E−01 −4.4540E−02 −1.1950E−01 −1.4166E−02 A12=−1.4703E−01 −1.9323E−01 −1.7727E−01 1.3155E−02 4.5363E−02 2.8939E−03A14= 3.2643E−02 4.0760E−02 3.3965E−02 −1.8009E−03 −1.1179E−02−3.1529E−04 A16= −2.5225E−03 −3.3385E−03 −2.1823E−03 7.8936E−051.6143E−03 1.3849E−05 A18= 2.7057E−07 −9.0546E−05 −1.0128E−04 A20=Surface # 15 16 17 18 k= −6.3267E+00 −4.4864E+00 9.0000E+01 −9.0000E+01A4= −1.8181E−01 −1.2114E−01 −5.9752E−02 −2.7501E−02 A6= 9.4869E−025.7826E−02 6.7728E−02 3.2251E−02 A8= −5.7436E−02 −2.2330E−02 −3.5115E−02−1.4585E−02 A10= 2.6763E−02 5.8772E−03 1.0019E−02 3.4594E−03 A12=−7.6649E−03 −9.4439E−04 −1.7284E−03 −4.9123E−04 A14= 1.3306E−038.5750E−05 1.8564E−04 4.3627E−05 A16= −1.3776E−04 −3.7276E−06−1.2162E−05 −2.3901E−06 A18= 7.8482E−06 2.6386E−08 4.4548E−07 7.4254E−08A20= −1.8964E−07 2.1119E−09 −7.0015E−09 −1.0048E−09

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 5th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 4.56 |f/fi|max 0.87 Fno 1.55 (f/f2) + (f/f3) 0.33HFOV [deg.] 39.2 CTf [mm] 0.21 Nmax 1.671 TL [mm] 5.96 Nmin 1.530 TL/f1.31 (V2 + V6)/V1 0.70 TL/ImgH 1.55 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.93 (V4 + V5 + V6)/V1 1.70 Y11/Y82 0.43 ATmax/CTmin 3.14 HFOV × EPD/f25.30 ATmax/ImgH 0.16 TL/ImgH + f/EPD 3.10 (R11 − R12)/(R11 + R12) 0.20TL{circumflex over ( )}2/(ImgH × EPD) 3.14 f/R16 −0.05 f/fG1 0.31EPD/ΣCT 0.88 f/fG2 1.11 EPD/BL 4.73 f/fG3 −0.85 TL/EPD 2.02 Yc71/f 0.20f/EPD 1.55 Yc72/f 0.30 f1/f2 −0.54 Yc81/f — f/f2 −0.30 Yc82/f 0.26\0.36

In the image capturing optical assembly according to the 5th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 510 through the eighthlens element 580 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

5th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.10 |f/Rf| + |f/R9| + |f/R10|3.31 |f/Rr| |f/R3| + |f/R4| 3.39 |f/Rr| |f/R11| + |f/R12| 2.04 |f/R5| +|f/R6| 2.63 |f/R13| + |f/R14| 6.90 |f/R7| + |f/R8| 0.38 |f/R15| +|f/R16| 0.13

In the 5th embodiment, each of four of the first lens element 510, thesecond lens element 520, the third lens element 530, the fourth lenselement 540, the fifth lens element 550, the sixth lens element 560, theseventh lens element 570, and the eighth lens element 580 has an Abbenumber smaller than 24.0; in detail, the four lens elements are thesecond lens element 520, the fourth lens element 540, the sixth lenselement 560, and the eighth lens element 580, wherein each of the Abbenumbers of the second lens element 520, the fourth lens element 540 andthe sixth lens element 560 is smaller than 23.0 and 20.

In the 5th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element510, the second lens element 520, the third lens element 530, the fourthlens element 540, the fifth lens element 550, the sixth lens element560, the seventh lens element 570, and the eighth lens element 580 arelisted in the table below. Moreover, in the 5th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=23.

5th Embodiment—numbers of the inflection points 510 520 530 540 550 6560570 580 Object-side 1 0 2 1 0 2 3 3 surface Image-side 1 0 1 1 1 3 1 3surface

6th Embodiment

FIG. 11 is a schematic view of an imaging apparatus according to the 6thembodiment of the present disclosure. FIG. 12 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 6th embodiment. In FIG. 11, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 696. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 600, a first lens element 610, a second lens element 620,a third lens element 630, a stop 601, a fourth lens element 640, a fifthlens element 650, a sixth lens element 660, a seventh lens element 670,an eighth lens element 680, a filter 690 and an image surface 695,wherein the image sensor 696 is disposed on the image surface 695 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (610, 620, 630, 640, 650, 660, 670 and 680)without additional one or more lens elements inserted between the firstlens element 610 and the eighth lens element 680, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 610 and thesecond lens element 620 belong to a first lens group (its referencenumeral is omitted). The third lens element 630, the fourth lens element640 and the fifth lens element 650 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 660, the seventhlens element 670 and the eighth lens element 680 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex and an image-side surface 612 beingconcave. The first lens element 610 is made of a plastic material, andhas the object-side surface 611 and the image-side surface 612 beingboth aspheric. Furthermore, each of the object-side surface 611 and theimage-side surface 612 of the first lens element 610 includes at leastone inflection point.

The second lens element 620 with negative refractive power has anobject-side surface 621 being convex and an image-side surface 622 beingconcave. The second lens element 620 is made of a plastic material, andhas the object-side surface 621 and the image-side surface 622 beingboth aspheric. Furthermore, the object-side surface 621 of the secondlens element 620 includes at least one inflection point.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex and an image-side surface 632 beingconcave. The third lens element 630 is made of a plastic material, andhas the object-side surface 631 and the image-side surface 632 beingboth aspheric. Furthermore, each of the object-side surface 631 and theimage-side surface 632 of the third lens element 630 includes at leastone inflection point.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being convex and an image-side surface 642 beingconcave. The fourth lens element 640 is made of a plastic material, andhas the object-side surface 641 and the image-side surface 642 beingboth aspheric. Furthermore, each of the object-side surface 641 and theimage-side surface 642 of the fourth lens element 640 includes at leastone inflection point.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being concave and an image-side surface 652being convex. The fifth lens element 650 is made of a plastic material,and has the object-side surface 651 and the image-side surface 652 beingboth aspheric. Furthermore, the image-side surface 652 of the fifth lenselement 650 includes at least one inflection point.

The sixth lens element 660 with negative refractive power has anobject-side surface 661 being convex and an image-side surface 662 beingconcave. The sixth lens element 660 is made of a plastic material, andhas the object-side surface 661 and the image-side surface 662 beingboth aspheric. Furthermore, each of the object-side surface 661 and theimage-side surface 662 of the sixth lens element 660 includes at leastone inflection point.

The seventh lens element 670 with negative refractive power has anobject-side surface 671 being convex and an image-side surface 672 beingconcave. The seventh lens element 670 is made of a plastic material, andhas the object-side surface 671 and the image-side surface 672 beingboth aspheric. Furthermore, each of the object-side surface 671 and theimage-side surface 672 of the seventh lens element 670 includes at leastone inflection point and at least one critical point.

The eighth lens element 680 with negative refractive power has anobject-side surface 681 being concave and an image-side surface 682being convex. The eighth lens element 680 is made of a plastic material,and has the object-side surface 681 and the image-side surface 682 beingboth aspheric. Furthermore, each of the object-side surface 681 and theimage-side surface 682 of the eighth lens element 680 includes at leastone inflection point, and the image-side surface 682 of the eighth lenselement 680 includes at least one critical point.

The filter 690 is made of a glass material and located between theeighth lens element 680 and the image surface 695, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 4.40 mm, Fno = 1.48, HFOV = 40.2 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.390 2 Lens 1 2.289 ASP 0.653Plastic 1.535 55.4 8.16 3 4.328 ASP 0.032 4 Lens 2 2.919 ASP 0.200Plastic 1.664 19.8 −14.28 5 2.171 ASP 0.216 6 Lens 3 2.362 ASP 0.484Plastic 1.528 55.7 7.18 7 5.822 ASP 0.038 8 Stop Plano 0.408 9 Lens 4299.924 ASP 0.292 Plastic 1.669 19.4 −18.70 10 12.005 ASP 0.165 11 Lens5 −5.142 ASP 0.509 Plastic 1.536 55.9 5.56 12 −1.952 ASP 0.078 13 Lens 65.078 ASP 0.379 Plastic 1.669 19.4 −22.67 14 3.691 ASP 0.606 15 Lens 71.313 ASP 0.380 Plastic 1.513 55.5 −10.03 16 0.943 ASP 0.412 17 Lens 8−73.141 ASP 0.423 Plastic 1.585 32.8 −409.57 18 −105.510 ASP 0.240 19Filter Plano 0.210 Glass 1.517 64.2 — 20 Plano 0.146 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 8 is 1.400 mm.

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.4779E−01−1.1621E+00 −2.6720E+01 −1.2243E+01 −9.3304E+00 6.1413E+00 A4=−1.6388E−03 −2.9488E−02 1.1150E−02 2.2211E−04 3.3459E−02 −1.4677E−02 A6=2.0932E−03 −3.0149E−02 −7.6152E−02 −1.8583E−02 −5.5863E−02 −4.4073E−03A8= −8.8976E−03 2.2668E−02 8.7425E−02 2.1139E−02 3.1382E−02 −3.6209E−02A10= 6.1335E−03 −7.2569E−03 −4.3637E−02 3.5214E−03 −1.2839E−023.4470E−02 A12= −3.0576E−03 6.4819E−04 1.2379E−02 −7.5283E−03 1.5222E−03−1.4060E−02 A14= 4.4047E−04 −1.6036E−03 2.1279E−03 5.5266E−04 2.0083E−03Surface # 9 10 11 12 13 14 k= −2.1585E+01 5.3179E+01 9.3180E+00−1.2550E+00 1.0481E+00 −7.0282E+00 A4= −1.2106E−01 −1.9796E−01−1.5661E−01 5.3287E−02 1.3206E−01 4.4391E−02 A6= 1.4069E−01 3.8746E−014.9051E−01 −6.8722E−02 −2.5410E−01 −8.1188E−02 A8= −2.9480E−01−5.8217E−01 −5.8410E−01 5.5383E−02 2.1011E−01 4.2486E−02 A10= 2.7479E−014.5893E−01 3.5840E−01 −1.4582E−02 −1.1951E−01 −1.4166E−02 A12=−1.1531E−01 −1.9324E−01 −1.0319E−01 −4.7595E−03 4.5361E−02 2.8940E−03A14= 1.8422E−02 4.0754E−02 2.6068E−03 3.1772E−03 −1.1179E−02 −3.1525E−04A16= −1.8143E−04 −3.3415E−03 5.1856E−03 −4.3668E−04 1.6142E−031.3864E−05 A18= −9.9119E−07 −8.1201E−04 −1.0128E−04 Surface # 15 16 1718 k= −7.3562E+00 −4.2432E+00 7.1682E+01 2.3726E+01 A4= −1.1543E−01−1.0129E−01 −7.6798E−02 −4.7548E−02 A6= 8.8375E−03 3.6284E−02 8.7437E−025.1083E−02 A8= 9.1538E−03 −9.2684E−03 −4.5233E−02 −2.2499E−02 A10=−4.1888E−03 1.4209E−03 1.2945E−02 5.3539E−03 A12= 1.1135E−03 −4.8093E−05−2.2408E−03 −7.7208E−04 A14= −2.0406E−04 −2.1882E−05 2.4098E−046.9982E−05 A16= 2.3929E−05 3.7291E−06 −1.5767E−05 −3.9169E−06 A18=−1.5731E−06 −2.4045E−07 5.7561E−07 1.2409E−07 A20= 4.3680E−08 5.7038E−09−9.0015E−09 −1.7055E−09

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 6th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 4.40 |f/fi|max 0.79 Fno 1.48 (f/f2) + (f/f3) 0.30HFOV [deg.] 40.2 CTf [mm] 0.21 Nmax 1.669 TL [mm] 5.87 Nmin 1.514 TL/f1.33 (V2 + V6)/V1 0.71 TL/ImgH 1.52 |(V2 − V3)/(V4 − V5)| 0.98 SD/TD0.93 (V4 + V5 + V6)/V1 1.71 Y11/Y82 0.43 ATmax/CTmin 3.03 HFOV × EPD/f27.19 ATmax/ImgH 0.16 TL/ImgH + f/EPD 3.00 (R11 − R12)/(R11 + R12) 0.16TL{circumflex over ( )}2/(ImgH × EPD) 3.01 f/R16 −0.04 f/fG1 0.28EPD/ΣCT 0.90 f/fG2 1.03 EPD/BL 4.99 f/fG3 −0.67 TL/EPD 1.97 Yc71/f 0.22f/EPD 1.48 Yc72/f 0.34 f1/f2 −0.57 Yc81/f — f/f2 −0.31 Yc82/f 0.28\0.38

In the image capturing optical assembly according to the 6th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 610 through the eighthlens element 680 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

6th Embodiment |f/Rf| + |f/R1| + |f/R2| 2.94 [f/Rf| + |f/R9| + |f/R10|3.11 |f/Rr| |f/R3| + |f/R4| 3.53 |f/Rr| |f/R11| + |f/R12| 2.06 |f/R5| +|f/R6| 2.62 |f/R13| + |f/R14| 8.01 |f/R7| + |f/R8| 0.38 |f/R15| +|f/R16| 0.10

In the 6th embodiment, each of three of the first lens element 610, thesecond lens element 620, the third lens element 630, the fourth lenselement 640, the fifth lens element 650, the sixth lens element 660, theseventh lens element 670, and the eighth lens element 680 has an Abbenumber smaller than 24.0, 23.0 and 20; in detail, the three lenselements are the second lens element 620, the fourth lens element 640,the sixth lens element 660.

In the 6th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element610, the second lens element 620, the third lens element 630, the fourthlens element 640, the fifth lens element 650, the sixth lens element660, the seventh lens element 670, the eighth lens element 680 arelisted in the table below. Moreover, in the 6th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=24.

6th Embodiment—numbers of the inflection points 610 620 630 640 650 660670 680 Object-side 1 2 2 1 0 2 3 3 surface Image-side 1 0 1 2 1 1 1 3surface

7th Embodiment

FIG. 13 is a schematic view of an imaging apparatus according to the 7thembodiment of the present disclosure. FIG. 14 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 7th embodiment. In FIG. 13, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 796. The image capturing opticalassembly includes, in order from an object side to an image side, anaperture stop 700, a first lens element 710, a second lens element 720,a third lens element 730, a stop 701, a fourth lens element 740, a fifthlens element 750, a sixth lens element 760, a seventh lens element 770,an eighth lens element 780, a filter 790 and an image surface 795,wherein the image sensor 796 is disposed on the image surface 795 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (710, 720, 730, 740, 750, 760, 770 and 780)without additional one or more lens elements inserted between the firstlens element 710 and the eighth lens element 780, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 710 and thesecond lens element 720 belong to a first lens group (its referencenumeral is omitted). The third lens element 730, the fourth lens element740 and the fifth lens element 750 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 760, the seventhlens element 770 and the eighth lens element 780 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex and an image-side surface 712 beingconcave. The first lens element 710 is made of a plastic material, andhas the object-side surface 711 and the image-side surface 712 beingboth aspheric. Furthermore, each of the object-side surface 711 and theimage-side surface 712 of the first lens element 710 includes at leastone inflection point.

The second lens element 720 with negative refractive power has anobject-side surface 721 being convex and an image-side surface 722 beingconcave. The second lens element 720 is made of a plastic material, andhas the object-side surface 721 and the image-side surface 722 beingboth aspheric. Furthermore, the object-side surface 721 of the secondlens element 720 includes at least one inflection point.

The third lens element 730 with positive refractive power has anobject-side surface 731 being convex and an image-side surface 732 beingconcave. The third lens element 730 is made of a plastic material, andhas the object-side surface 731 and the image-side surface 732 beingboth aspheric. Furthermore, each of the object-side surface 731 and theimage-side surface 732 of the third lens element 730 includes at leastone inflection point.

The fourth lens element 740 with negative refractive power has anobject-side surface 741 being convex and an image-side surface 742 beingconcave. The fourth lens element 740 is made of a plastic material, andhas the object-side surface 741 and the image-side surface 742 beingboth aspheric. Furthermore, each of the object-side surface 741 and theimage-side surface 742 of the fourth lens element 740 includes at leastone inflection point.

The fifth lens element 750 with positive refractive power has anobject-side surface 751 being concave and an image-side surface 752being convex. The fifth lens element 750 is made of a plastic material,and has the object-side surface 751 and the image-side surface 752 beingboth aspheric. Furthermore, the image-side surface 752 of the fifth lenselement 750 includes at least one inflection point.

The sixth lens element 760 with negative refractive power has anobject-side surface 761 being convex and an image-side surface 762 beingconcave. The sixth lens element 760 is made of a plastic material, andhas the object-side surface 761 and the image-side surface 762 beingboth aspheric. Furthermore, each of the object-side surface 761 and theimage-side surface 762 of the sixth lens element 760 includes at leastone inflection point.

The seventh lens element 770 with negative refractive power has anobject-side surface 771 being convex and an image-side surface 772 beingconcave. The seventh lens element 770 is made of a plastic material, andhas the object-side surface 771 and the image-side surface 772 beingboth aspheric. Furthermore, each of the object-side surface 771 and theimage-side surface 772 of the seventh lens element 770 includes at leastone inflection point and at least one critical point.

The eighth lens element 780 with negative refractive power has anobject-side surface 781 being convex and an image-side surface 782 beingconcave. The eighth lens element 780 is made of a plastic material, andhas the object-side surface 781 and the image-side surface 782 beingboth aspheric. Furthermore, each of the object-side surface 781 and theimage-side surface 782 of the eighth lens element 780 includes at leastone inflection point and at least one critical point.

The filter 790 is made of a glass material and located between theeighth lens element 780 and the image surface 795, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 4.44 mm, Fno = 1.50, HFOV = 40.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.390 2 Lens 1 2.363 ASP 0.684Plastic 1.544 56.0 7.55 3 5.000 ASP 0.030 4 Lens 2 3.131 ASP 0.241Plastic 1.669 19.4 −15.14 5 2.318 ASP 0.241 6 Lens 3 2.723 ASP 0.518Plastic 1.544 56.0 7.65 7 7.341 ASP 0.043 8 Stop Plano 0.413 9 Lens 41069.663 ASP 0.356 Plastic 1.666 19.7 −17.93 10 11.807 ASP 0.141 11 Lens5 −5.232 ASP 0.528 Plastic 1.539 55.9 5.27 12 −1.908 ASP 0.075 13 Lens 66.376 ASP 0.414 Plastic 1.651 21.1 −15.20 14 3.777 ASP 0.370 15 Lens 71.412 ASP 0.379 Plastic 1.513 55.5 −10.44 16 1.016 ASP 0.285 17 Lens 82.683 ASP 0.311 Plastic 1.513 55.5 −48.31 18 2.326 ASP 0.299 19 FilterPlano 0.210 Glass 1.517 64.2 — 20 Plano 0.364 21 Image Plano — Referencewavelength is 587.6 nm (d-line). Effective radius of the stop on Surface8 is 1.400 mm.

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −9.0910E−02−6.5336E−01 −2.6269E+01 −1.2506E+01 −1.1243E+01 3.4703E+00 A4=5.8347E−05 −2.8838E−02 6.1769E−03 6.2863E−03 2.3863E−02 −2.0332E−02 A6=1.3430E−03 −2.8326E−02 −7.7454E−02 −3.9205E−02 −5.1754E−02 −9.0551E−03A8= −8.4355E−03 2.2668E−02 8.7631E−02 4.3006E−02 3.2473E−02 −1.8762E−02A10= 6.1335E−03 −7.2569E−03 −4.3446E−02 −1.2675E−02 −1.8820E−021.5119E−02 A12= −2.9734E−03 6.4819E−04 1.2359E−02 −8.3353E−04 6.5114E−03−4.6293E−03 A14= 4.2800E−04 −1.6036E−03 1.1150E−03 −7.1158E−043.3959E−04 Surface # 9 10 11 12 13 14 k= −2.1585E+01 5.3878E+019.1327E+00 −1.2472E+00 2.8762E+00 −6.7174E+00 A4= −1.0355E−01−2.0154E−01 −2.0223E−01 3.7248E−02 1.3797E−01 4.5467E−02 A6= 6.0574E−023.8668E−01 6.3873E−01 −3.9594E−02 −2.5431E−01 −8.1099E−02 A8=−1.2101E−01 −5.8192E−01 −8.9980E−01 1.7445E−02 2.1006E−01 4.2496E−02A10= 7.7241E−02 4.5911E−01 7.1865E−01 1.2601E−02 −1.1952E−01 −1.4165E−02A12= 2.6013E−03 −1.9318E−01 −3.3543E−01 −1.4168E−02 4.5358E−022.8942E−03 A14= −1.7012E−02 4.0767E−02 8.9232E−02 4.6087E−03 −1.1179E−02−3.1523E−04 A16= 4.1129E−03 −3.3459E−03 −1.2401E−02 −5.0457E−041.6142E−03 1.3866E−05 A18= −7.0049E−06 6.9306E−04 −1.0127E−04 Surface #15 16 17 18 k= −6.2724E+00 −4.0121E+00 −9.0000E+01 −6.5886E+01 A4=−1.4691E−01 −1.3891E−01 −1.0690E−01 −6.0163E−02 A6= 2.4563E−026.7302E−02 1.2531E−01 6.1593E−02 A8= −3.1650E−03 −2.2900E−02 −6.4542E−02−2.7041E−02 A10= 4.4234E−03 4.8428E−03 1.8001E−02 6.3193E−03 A12=−2.1760E−03 −5.0171E−04 −2.9823E−03 −8.7498E−04 A14= 4.9708E−043.2094E−07 3.0288E−04 7.4617E−05 A16= −6.0641E−05 5.0160E−06 −1.8551E−05−3.8722E−06 A18= 3.8323E−06 −4.3105E−07 6.3046E−07 1.1290E−07 A20=−9.8440E−08 1.1697E−08 −9.1510E−09 −1.4278E−09

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 7th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 4.44 |f/fi|max 0.84 Fno 1.50 (f/f2) + (f/f3) 0.29HFOV [deg.] 40.6 CTf [mm] 0.21 Nmax 1.669 TL [mm] 5.90 Nmin 1.514 TL/f1.33 (V2 + V6)/V1 0.72 TL/mgH 1.49 |(V2 − V3)/(V4 − V5)| 1.01 SD/TD 0.92(V4 + V5 + V6)/V1 1.73 Y11/Y82 0.41 ATmax/CTmin 1.89 HFOV × EPD/f 27.09ATmax/ImgH 0.12 TL/ImgH + f/EPD 2.99 (R11 − R12)/(R11 + R12) 0.26TL{circumflex over ( )}2/(ImgH × EPD) 2.98 f/R16 1.91 f/fG1 0.35 EPD/ΣCT0.86 f/fG2 1.04 EPD/BL 3.39 f/fG3 −0.88 TL/EPD 1.99 Yc71/f 0.21 f/EPD1.50 Yc72/f 0.32 f1/f2 −0.50 Yc81/f 0.39\0.73 f/f2 −0.29 Yc82/f0.43\0.76

In the image capturing optical assembly according to the 7th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 710 through the eighthlens element 780 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

7th Embodiment |f/Rf| + |f/R1| + |f/R2| 2.77 |f/Rf| + |f/R9| + |f/R10|3.18 |f/Rr| |f/R3| + |f/R4| 3.33 |f/Rr| |f/R11| + |f/R12| 1.87 |f/R5| +|f/R6| 2.24 |f/R13| + |f/R14| 7.52 |f/R7| + |f/R8| 0.38 |f/R15| +|f/R16| 3.57

In the 7th embodiment, each of three of the first lens element 710, thesecond lens element 720, the third lens element 730, the fourth lenselement 740, the fifth lens element 750, the sixth lens element 760, theseventh lens element 770, and the eighth lens element 780 has an Abbenumber smaller than 24.0 and 23.0; in detail, the three lens elementsare the second lens element 720, the fourth lens element 740, the sixthlens element 760, wherein each of the Abbe numbers of the second lenselement 720 and the fourth lens element 740 is smaller than 20.

In the 7th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element710, the second lens element 720, the third lens element 730, the fourthlens element 740, the fifth lens element 750, the sixth lens element760, the seventh lens element 770, and the eighth lens element 780 arelisted in the table below. Moreover, in the 7th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=38.

7th Embodiment—numbers of the inflection points 710 720 730 740 750 760770 780 Object-side 1 2 2 2 0 2 4 7 surface Image-side 1 0 1 2 2 4 1 7surface

8th Embodiment

FIG. 15 is a schematic view of an imaging apparatus according to the 8thembodiment of the present disclosure. FIG. 16 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 8th embodiment. In FIG. 15, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 896. The image capturing opticalassembly includes, in order from an object side to an image side, afirst lens element 810, a second lens element 820, an aperture stop 800,a third lens element 830, a fourth lens element 840, a stop 801, a fifthlens element 850, a sixth lens element 860, a seventh lens element 870,an eighth lens element 880, a filter 890 and an image surface 895,wherein the image sensor 896 is disposed on the image surface 895 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (810, 820, 830, 840, 850, 860, 870 and 880)without additional one or more lens elements inserted between the firstlens element 810 and the eighth lens element 880, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 810 and thesecond lens element 820 belong to a first lens group (its referencenumeral is omitted). The third lens element 830, the fourth lens element840 and the fifth lens element 850 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 860, the seventhlens element 870 and the eighth lens element 880 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 810 with negative refractive power has anobject-side surface 811 being convex and an image-side surface 812 beingconcave. The first lens element 810 is made of a plastic material, andhas the object-side surface 811 and the image-side surface 812 beingboth aspheric. Furthermore, each of the object-side surface 811 and theimage-side surface 812 of the first lens element 810 includes at leastone inflection point.

The second lens element 820 with positive refractive power has anobject-side surface 821 being convex and an image-side surface 822 beingconcave. The second lens element 820 is made of a plastic material, andhas the object-side surface 821 and the image-side surface 822 beingboth aspheric. Furthermore, each of the object-side surface 821 and theimage-side surface 822 of the second lens element 820 includes at leastone inflection point.

The third lens element 830 with negative refractive power has anobject-side surface 831 being convex and an image-side surface 832 beingconcave. The third lens element 830 is made of a plastic material, andhas the object-side surface 831 and the image-side surface 832 beingboth aspheric. Furthermore, the object-side surface 831 of the thirdlens element 830 includes at least one inflection point.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being convex and an image-side surface 842 beingconcave. The fourth lens element 840 is made of a plastic material, andhas the object-side surface 841 and the image-side surface 842 beingboth aspheric. Furthermore, each of the object-side surface 841 and theimage-side surface 842 of the fourth lens element 840 includes at leastone inflection point.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave and an image-side surface 852being concave. The fifth lens element 850 is made of a plastic material,and has the object-side surface 851 and the image-side surface 852 beingboth aspheric. Furthermore, each of the object-side surface 851 and theimage-side surface 852 of the fifth lens element 850 includes at leastone inflection point.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being concave and an image-side surface 862being convex. The sixth lens element 860 is made of a plastic material,and has the object-side surface 861 and the image-side surface 862 beingboth aspheric. Furthermore, each of the object-side surface 861 and theimage-side surface 862 of the sixth lens element 860 includes at leastone inflection point.

The seventh lens element 870 with positive refractive power has anobject-side surface 871 being convex and an image-side surface 872 beingconvex. The seventh lens element 870 is made of a plastic material, andhas the object-side surface 871 and the image-side surface 872 beingboth aspheric. Furthermore, each of the object-side surface 871 and theimage-side surface 872 of the seventh lens element 870 includes at leastone inflection point and at least one critical point.

The eighth lens element 880 with negative refractive power has anobject-side surface 881 being convex and an image-side surface 882 beingconcave. The eighth lens element 880 is made of a plastic material, andhas the object-side surface 881 and the image-side surface 882 beingboth aspheric. Furthermore, each of the object-side surface 881 and theimage-side surface 882 of the eighth lens element 880 includes at leastone inflection point and at least one critical point.

The filter 890 is made of a glass material and located between theeighth lens element 880 and the image surface 895, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 3.81 mm, Fno = 1.57, HFOV = 39.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.920 ASP 0.182 Plastic 1.669 19.5 −62.022 1.765 ASP 0.030 3 Lens 2 1.857 ASP 0.573 Plastic 1.545 56.0 5.44 44.432 ASP 0.037 5 Ape. Stop Plano 0.003 6 Lens 3 3.264 ASP 0.230 Plastic1.669 19.5 −18.06 7 2.497 ASP 0.184 8 Lens 4 2.420 ASP 0.437 Plastic1.544 56.0 6.25 9 7.865 ASP −0.040 10 Stop Plano 0.359 11 Lens 5 −18.280ASP 0.317 Plastic 1.669 19.5 −9.58 12 9.931 ASP 0.119 13 Lens 6 −4.234ASP 0.450 Plastic 1.544 56.0 4.21 14 −1.543 ASP 0.025 15 Lens 7 12.076ASP 0.387 Plastic 1.669 19.5 16.64 16 −140.349 ASP 0.278 17 Lens 8 2.433ASP 0.312 Plastic 1.544 56.0 −3.41 18 1.005 ASP 0.400 19 Filter Plano0.210 Plastic 1.544 56.0 — 20 Plano 0.562 21 Image Plano — Referencewavelength is 587.6 nm (d-line). Effective radius of the stop on Surface10 is 1.160 mm.

TABLE 16 Aspheric Coefficients Surface # 1 2 3 4 6 7 k= −4.3103E−01−2.7695E−01 −3.8667E−01 −3.9922E+00 −3.7464E+01 −1.8452E+01 A4=−1.5135E−02 −5.5586E−03 1.0100E−02 −5.8373E−02 1.2402E−02 4.5875E−03 A6=2.3019E−02 −2.7074E−02 −4.6149E−02 −6.8163E−02 −2.0369E−01 −7.7310E−02A8= −5.3485E−02 2.9887E−03 3.9482E−02 8.4238E−02 3.6361E−01 7.4956E−02A10= 4.7621E−02 3.8215E−03 −2.8954E−02 −4.4092E−02 −3.2601E−013.6871E−02 A12= −2.3235E−02 −2.9578E−03 8.1130E−03 1.0370E−02 1.6581E−01−8.9116E−02 A14= 4.0090E−03 −3.5221E−02 3.9998E−02 Surface # 8 9 11 1213 14 k= −1.6655E+01 −6.8319E+00 9.0000E+01 5.4464E+01 8.8723E+00−1.1897E+00 A4= 5.9142E−02 −2.4568E−02 −2.6154E−01 −3.4711E−01−2.0588E−01 1.4705E−01 A6= −1.5637E−01 −6.4073E−02 3.8810E−01 9.4391E−011.3092E+00 −2.6104E−01 A8= 1.2277E−01 7.0349E−03 −9.6169E−01 −2.0257E+00−2.7040E+00 3.3022E−01 A10= −9.9744E−02 −2.7123E−02 1.2886E+002.2809E+00 2.8482E+00 −2.6879E−01 A12= 3.2886E−02 2.2785E−02 −8.7024E−01−1.3711E+00 −1.6385E+00 1.2969E−01 A14= 3.9910E−03 −5.5447E−032.6495E−01 4.1305E−01 4.8642E−01 −3.2261E−02 A16= −2.3335E−02−4.8437E−02 −5.8327E−02 3.1158E−03 Surface # 15 16 17 18 k= 3.0182E+00−2.3943E+00 −2.2655E+01 −6.0624E+00 A4= 2.3205E−01 9.0345E−02−4.9378E−01 −2.6178E−01 A6= −6.2269E−01 −2.0024E−01 4.5553E−012.3749E−01 A8= 7.3081E−01 1.4770E−01 −3.0082E−01 −1.4793E−01 A10=−5.9375E−01 −7.0409E−02 1.3859E−01 6.2715E−02 A12= 3.2198E−01 2.0540E−02−4.0662E−02 −1.7982E−02 A14= −1.1327E−01 −3.1943E−03 7.0126E−033.3976E−03 A16= 2.3364E−02 2.0101E−04 −6.1286E−04 −4.0235E−04 A18=−2.0940E−03 1.4712E−05 2.6832E−05 A20= 7.3927E−07 −7.6057E−07

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 8th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 3.81 |f/fi|max 1.12 Fno 1.57 (f/f2) + (f/f3) 0.49HFOV [deg.] 39.9 CTf [mm] 0.21 Nmax 1.669 TL [mm] 5.05 Nmin 1.544 TL/f1.33 (V2 + V6)/V1 5.74 TL/ImgH 1.53 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.79 (V4 + V5 + V6)/V1 6.74 Y11/Y82 0.57 ATmax/CTmin 1.75 HFOV × EPD/f25.43  ATmax/ImgH 0.10 TL/ImgH + f/EPD 3.10 (R11 − R12)/(R11 + R12) 0.47TL{circumflex over ( )}2/(ImgH × EPD) 3.19 f/R16 3.79 f/fG1 0.61 EPD/ΣCT0.84 f/fG2 0.03 EPD/BL 2.07 f/fG3 0.28 TL/EPD 2.08 Yc71/f 0.21 f/EPD1.57 Yc72/f 0.04\0.17 f1/f2 −11.40 Yc81/f 0.12 f/f2 0.70 Yc82/f 0.29

In the image capturing optical assembly according to the 8th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 810 through the eighthlens element 880 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

8th Embodiment |f/Rf| + |f/R1| + |f/R2| 4.14 |f/Rf| + |f/R9| + |f/R10|0.59 |f/Rr| |f/R3| + |f/R4| 2.91 |f/Rr| |f/R11| + |f/R12| 3.37 |f/R5| +|f/R6| 2.69 |f/R13| + |f/R14| 0.34 |f/R7| + |f/R8| 2.06 |f/R15| +|f/R16| 5.36

In the 8th embodiment, each of four of the first lens element 810, thesecond lens element 820, the third lens element 830, the fourth lenselement 840, the fifth lens element 850, the sixth lens element 860, theseventh lens element 870, and the eighth lens element 880 has an Abbenumber smaller than 24.0, 23.0 and 20; in detail, the four lens elementsare the first lens element 810, the third lens element 830, the fifthlens element 850 and the seventh lens element 870.

In the 8th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element810, the second lens element 820, the third lens element 830, the fourthlens element 840, the fifth lens element 850, the sixth lens element860, the seventh lens element 870, and the eighth lens element 880 arelisted in the table below. Moreover, in the 8th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=26.

8th Embodiment—numbers of the inflection points 810 820 830 840 850 860870 880 Object-side 1 2 2 1 1 2 2 3 surface Image-side 1 2 0 1 2 2 2 2surface

9th Embodiment

FIG. 17 is a schematic view of an imaging apparatus according to the 9thembodiment of the present disclosure. FIG. 18 shows spherical aberrationcurves, astigmatic field curves and a distortion curve of the imagingapparatus according to the 9th embodiment. In FIG. 17, the imagingapparatus includes an image capturing optical assembly (its referencenumeral is omitted) and an image sensor 996. The image capturing opticalassembly includes, in order from an object side to an image side, afirst lens element 910, a second lens element 920, an aperture stop 900,a third lens element 930, a fourth lens element 940, a stop 901, a fifthlens element 950, a sixth lens element 960, a seventh lens element 970,an eighth lens element 980, a filter 990 and an image surface 995,wherein the image sensor 996 is disposed on the image surface 995 of theimage capturing optical assembly. The image capturing optical assemblyincludes eight lens elements (910, 920, 930, 940, 950, 960, 970 and 980)without additional one or more lens elements inserted between the firstlens element 910 and the eighth lens element 980, and there is an airgap in a paraxial region between every adjacent lens elements of theimage capturing optical assembly. The first lens element 910 and thesecond lens element 920 belong to a first lens group (its referencenumeral is omitted). The third lens element 930, the fourth lens element940 and the fifth lens element 950 belong to a second lens group (itsreference numeral is omitted). The sixth lens element 960, the seventhlens element 970 and the eighth lens element 980 belong to a third lensgroup (its reference numeral is omitted).

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex and an image-side surface 912 beingconcave. The first lens element 910 is made of a plastic material, andhas the object-side surface 911 and the image-side surface 912 beingboth aspheric. Furthermore, each of the object-side surface 911 and theimage-side surface 912 of the first lens element 910 includes at leastone inflection point.

The second lens element 920 with positive refractive power has anobject-side surface 921 being convex and an image-side surface 922 beingconvex. The second lens element 920 is made of a plastic material, andhas the object-side surface 921 and the image-side surface 922 beingboth aspheric. Furthermore, the object-side surface 921 of the secondlens element 920 includes at least one inflection point.

The third lens element 930 with negative refractive power has anobject-side surface 931 being convex and an image-side surface 932 beingconcave. The third lens element 930 is made of a plastic material, andhas the object-side surface 931 and the image-side surface 932 beingboth aspheric. Furthermore, the object-side surface 931 of the thirdlens element 930 includes at least one inflection point.

The fourth lens element 940 with positive refractive power has anobject-side surface 941 being convex and an image-side surface 942 beingconcave. The fourth lens element 940 is made of a plastic material, andhas the object-side surface 941 and the image-side surface 942 beingboth aspheric. Furthermore, each of the object-side surface 941 and theimage-side surface 942 of the fourth lens element 940 includes at leastone inflection point.

The fifth lens element 950 with negative refractive power has anobject-side surface 951 being convex and an image-side surface 952 beingconcave. The fifth lens element 950 is made of a plastic material, andhas the object-side surface 951 and the image-side surface 952 beingboth aspheric. Furthermore, each of the object-side surface 951 and theimage-side surface 952 of the fifth lens element 950 includes at leastone inflection point.

The sixth lens element 960 with positive refractive power has anobject-side surface 961 being concave and an image-side surface 962being convex. The sixth lens element 960 is made of a plastic material,and has the object-side surface 961 and the image-side surface 962 beingboth aspheric. Furthermore, the image-side surface 962 of the sixth lenselement 960 includes at least one inflection point.

The seventh lens element 970 with negative refractive power has anobject-side surface 971 being convex and an image-side surface 972 beingconcave. The seventh lens element 970 is made of a plastic material, andhas the object-side surface 971 and the image-side surface 972 beingboth aspheric. Furthermore, each of the object-side surface 971 and theimage-side surface 972 of the seventh lens element 970 includes at leastone inflection point and at least one critical point.

The eighth lens element 980 with negative refractive power has anobject-side surface 981 being convex and an image-side surface 982 beingconcave. The eighth lens element 980 is made of a plastic material, andhas the object-side surface 981 and the image-side surface 982 beingboth aspheric. Furthermore, each of the object-side surface 981 and theimage-side surface 982 of the eighth lens element 980 includes at leastone inflection point and at least one critical point.

The filter 990 is made of a glass material and located between theeighth lens element 980 and the image surface 995, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 3.86 mm, Fno = 1.53, HFOV = 40.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.151 ASP 0.280 Plastic 1.545 56.0 8.82 23.716 ASP 0.036 3 Lens 2 5.716 ASP 0.479 Plastic 1.545 56.0 9.81 4−79.920 ASP −0.091  5 Ape. Stop Plano 0.131 6 Lens 3 2.789 ASP 0.230Plastic 1.671 19.5 −11.13 7 1.963 ASP 0.239 8 Lens 4 3.469 ASP 0.416Plastic 1.544 56.0 9.96 9 9.240 ASP 0.008 10 Stop Plano 0.294 11 Lens 5289.494 ASP 0.300 Plastic 1.671 19.5 −15.58 12 10.084 ASP 0.131 13 Lens6 −4.209 ASP 0.412 Plastic 1.544 56.0 3.81 14 −1.436 ASP 0.025 15 Lens 73.218 ASP 0.311 Plastic 1.671 19.5 −13.45 16 2.280 ASP 0.468 17 Lens 81.955 ASP 0.300 Plastic 1.544 56.0 −5.14 18 1.089 ASP 0.400 19 FilterPlano 0.210 Plastic 1.544 56.0 — 20 Plano 0.464 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 10 is 1.160 mm.

TABLE 18 Aspheric Coefficients Surface # 1 2 3 4 6 7 k= −8.9343E−01−2.3345E+00 4.5756E+00 −9.0000E+01 −4.0185E+01 −1.2107E+01  A4= 3.8950E−04  1.0493E−01 1.2733E−01 −7.9076E−02 −1.0115E−02 1.6090E−02A6= −6.2198E−02 −3.2556E−01 −3.3020E−01   7.5898E−02 −1.0082E−01−6.9715E−02  A8=  7.4568E−02  2.9849E−01 3.0684E−01 −6.2072E−02 2.2283E−01 8.9668E−02 A10= −6.8450E−02 −1.2902E−01 −1.3107E−01  2.5707E−02 −2.0970E−01 −4.8533E−02  A12=  2.7613E−02  2.2641E−022.2766E−02 −4.0658E−03  1.0351E−01 4.0565E−03 A14= −3.8984E−03−2.1910E−02 4.2449E−03 Surface # 8 9 11 12 13 14 k= −8.4956E+00 2.0174E+01  4.2796E+01  5.0020E+01  9.0278E+00 −1.2769E+00 A4= 1.0368E−02 −2.6874E−02 −1.9191E−01 −3.4442E−01 −3.0802E−01  1.8294E−01A6= −5.3904E−02 −3.8909E−02  2.2513E−01  9.4401E−01  1.6535E+00−1.5725E−01 A8=  7.2664E−02  3.5918E−02 −6.7260E−01 −2.0258E+00−3.2859E+00  1.0542E−01 A10= −9.3110E−02 −3.3080E−02  1.0847E+00 2.2812E+00  3.3697E+00 −1.0842E−01 A12=  4.7107E−02 −9.8007E−03−8.8028E−01 −1.3709E+00 −1.9098E+00  7.3005E−02 A14= −5.3997E−03 1.0043E−02  3.2943E−01  4.1296E−01  5.6896E−01 −2.1593E−02 A16=−4.2575E−02 −4.8647E−02 −7.0189E−02  2.1925E−03 Surface # 15 16 17 18 k=−5.6433E−01 −8.3566E+00 −6.0580E+00 −5.2650E+00 A4=  2.3101E−01 8.2653E−02 −4.8461E−01 −2.4576E−01 A6= −6.2576E−01 −2.0036E−01 4.4529E−01  1.6291E−01 A8=  7.3086E−01  1.4729E−01 −4.7691E−01−9.6450E−02 A10= −5.9360E−01 −7.0438E−02  3.9168E−01  4.3144E−02 A12= 3.2195E−01  2.0545E−02 −1.9931E−01 −1.2142E−02 A14= −1.1330E−01−3.1913E−03  6.2121E−02  1.9595E−03 A16=  2.3354E−02  2.0176E−04−1.1651E−02 −1.5725E−04 A18= −2.0933E−03  1.2100E−03  3.2002E−06 A20=−5.3445E−05  1.8901E−07

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 9th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 3.86 |f/fi|max 1.01 Fno 1.53 (f/f2) + (f/f3) 0.05HFOV [deg] 40.9 CTf [mm] 0.21 Nmax 1.671 TL [mm] 5.04 Nmin 1.544 TL/f1.31 (V2 + V6)/V1 2.00 TL/ImgH 1.47 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.82 (V4 + V5 + V6)/V1 2.35 Y11/Y82 0.59 ATmax/CTmin 2.03 HFOV × EPD/f26.71 ATmax/ImgH 0.14 TL/ImgH + f/EPD 3.00 (R11 − R12)/(R11 + R12) 0.49TL{circumflex over ( )}2/(ImgH × EPD) 2.94 f/R16 3.54 f/fG1 0.81 EPD/ΣCT0.92 f/fG2 −0.21 EPD/BL 2.35 f/fG3 0.21 TL/EPD 2.00 Yc71/f 0.26 f/EPD1.53 Yc72/f 0.29 f1/f2 0.90 Yc81/f 0.15 f/f2 0.39 Yc82/f 0.25

In the image capturing optical assembly according to the 9th embodiment,the focal length of the image capturing optical assembly is f, acurvature radius of an object-side surface of one of the lens elementsof the image capturing optical assembly is Rf, and a curvature radius ofan image-side surface of the lens element of the image capturing opticalassembly is Rr, and the value of the condition |f/Rf|+|f/Rr|corresponding to each of the first lens element 910 through the eighthlens element 980 is stated in the following table, wherein termdefinitions of the parameters related to each surface of the lenselements are the same as those of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

9th Embodiment |f/Rf| + |f/R1| + |f/R2| 2.83 |f/Rf| + |f/R9| + |f/R10|0.40 |f/Rr| |f/R3| + |f/R4| 0.72 |f/Rr| |f/R11| + |f/R12| 3.60 |f/R5| +|f/R6| 3.35 |f/R13| + |f/R14| 2.89 |f/R7| + |f/R8| 1.53 |f/R15| +|f/R16| 5.51

In the 9th embodiment, each of three of the first lens element 910, thesecond lens element 920, the third lens element 930, the fourth lenselement 940, the fifth lens element 950, the sixth lens element 960, theseventh lens element 970, and the eighth lens element 980 has an Abbenumber smaller than 24.0, 23.0 and 20; in detail, the three lenselements are the third lens element 930, the fifth lens element 950 andthe seventh lens element 970.

In the 9th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element910, the second lens element 920, the third lens element 930, the fourthlens element 940, the fifth lens element 950, the sixth lens element960, the seventh lens element 970, and the eighth lens element 980 arelisted in the table below. Moreover, in the 9th embodiment, a totalnumber of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=26.

9th Embodiment - numbers of the inflection points 910 920 930 940 950960 970 980 Object-side 1 2 3 2 1 0 3 4 surface Image-side 2 0 0 1 1 2 22 surface

10th Embodiment

FIG. 19 is a schematic view of an imaging apparatus according to the10th embodiment of the present disclosure. FIG. 20 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimaging apparatus according to the 10th embodiment. In FIG. 19, theimaging apparatus includes an image capturing optical assembly (itsreference numeral is omitted) and an image sensor 1096. The imagecapturing optical assembly includes, in order from an object side to animage side, a first lens element 1010, a second lens element 1020, anaperture stop 1000, a third lens element 1030, a fourth lens element1040, a stop 1001, a fifth lens element 1050, a sixth lens element 1060,a seventh lens element 1070, an eighth lens element 1080, a filter 1090and an image surface 1095, wherein the image sensor 1096 is disposed onthe image surface 1095 of the image capturing optical assembly. Theimage capturing optical assembly includes eight lens elements (1010,1020, 1030, 1040, 1050, 1060, 1070 and 1080) without additional one ormore lens elements inserted between the first lens element 1010 and theeighth lens element 1080, and there is an air gap in a paraxial regionbetween every adjacent lens elements of the image capturing opticalassembly. The first lens element 1010 and the second lens element 1020belong to a first lens group (its reference numeral is omitted). Thethird lens element 1030, the fourth lens element 1040 and the fifth lenselement 1050 belong to a second lens group (its reference numeral isomitted). The sixth lens element 1060, the seventh lens element 1070 andthe eighth lens element 1080 belong to a third lens group (its referencenumeral is omitted).

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex and an image-side surface 1012being concave. The first lens element 1010 is made of a plasticmaterial, and has the object-side surface 1011 and the image-sidesurface 1012 being both aspheric. Furthermore, each of the object-sidesurface 1011 and the image-side surface 1012 of the first lens element1010 includes at least one inflection point.

The second lens element 1020 with positive refractive power has anobject-side surface 1021 being convex and an image-side surface 1022being concave. The second lens element 1020 is made of a plasticmaterial, and has the object-side surface 1021 and the image-sidesurface 1022 being both aspheric. Furthermore, each of the object-sidesurface 1021 and the image-side surface 1022 of the second lens element1020 includes at least one inflection point.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being concave and an image-side surface 1032being concave. The third lens element 1030 is made of a plasticmaterial, and has the object-side surface 1031 and the image-sidesurface 1032 being both aspheric. Furthermore, the object-side surface1031 of the third lens element 1030 includes at least one inflectionpoint.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being convex and an image-side surface 1042being convex. The fourth lens element 1040 is made of a plasticmaterial, and has the object-side surface 1041 and the image-sidesurface 1042 being both aspheric. Furthermore, the object-side surface1041 of the fourth lens element 1040 includes at least one inflectionpoint.

The fifth lens element 1050 with negative refractive power has anobject-side surface 1051 being concave and an image-side surface 1052being concave. The fifth lens element 1050 is made of a plasticmaterial, and has the object-side surface 1051 and the image-sidesurface 1052 being both aspheric. Furthermore, the image-side surface1052 of the fifth lens element 1050 includes at least one inflectionpoint.

The sixth lens element 1060 with positive refractive power has anobject-side surface 1061 being concave and an image-side surface 1062being convex. The sixth lens element 1060 is made of a plastic material,and has the object-side surface 1061 and the image-side surface 1062being both aspheric. Furthermore, the image-side surface 1062 of thesixth lens element 1060 includes at least one inflection point.

The seventh lens element 1070 with negative refractive power has anobject-side surface 1071 being convex and an image-side surface 1072being concave. The seventh lens element 1070 is made of a plasticmaterial, and has the object-side surface 1071 and the image-sidesurface 1072 being both aspheric. Furthermore, each of the object-sidesurface 1071 and the image-side surface 1072 of the seventh lens element1070 includes at least one inflection point and at least one criticalpoint.

The eighth lens element 1080 with negative refractive power has anobject-side surface 1081 being convex and an image-side surface 1082being concave. The eighth lens element 1080 is made of a plasticmaterial, and has the object-side surface 1081 and the image-sidesurface 1082 being both aspheric. Furthermore, each of the object-sidesurface 1081 and the image-side surface 1082 of the eighth lens element1080 includes at least one inflection point and at least one criticalpoint.

The filter 1090 is made of a glass material and located between theeighth lens element 1080 and the image surface 1095, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 4.06 mm, Fno = 1.63, HFOV = 39.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.959 ASP 0.297 Plastic 1.545 56.0 10.672 2.798 ASP 0.039 3 Lens 2 3.026 ASP 0.506 Plastic 1.545 56.0 7.69 410.258 ASP −0.002  5 Ape. Stop Plano 0.111 6 Lens 3 −1041.667 ASP 0.230Plastic 1.671 19.5 −8.72 7 5.881 ASP 0.129 8 Lens 4 3.602 ASP 0.451Plastic 1.544 56.0 6.16 9 −46.484 ASP 0.013 10 Stop Plano 0.371 11 Lens5 −12.365 ASP 0.300 Plastic 1.660 20.4 −8.98 12 11.485 ASP 0.071 13 Lens6 −4.230 ASP 0.358 Plastic 1.544 56.0 4.58 14 −1.614 ASP 0.025 15 Lens 74.798 ASP 0.300 Plastic 1.671 19.5 −373.64 16 4.590 ASP 0.578 17 Lens 84.266 ASP 0.300 Plastic 1.544 56.0 −3.65 18 1.320 ASP 0.400 19 FilterPlano 0.210 Plastic 1.544 56.0 — 20 Plano 0.393 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 10 is 1.150 mm.

TABLE 20 Aspheric Coefficients Surface # 1 2 3 4 6 7 k= −6.0556E−01−8.4455E−01  2.1571E+00  5.9390E+01  9.0000E+01 −3.2646E+01 A4=−8.3741E−03 −2.6501E−02 −2.8003E−02 −2.6517E−02 −2.4209E−02 −4.2746E−02A6= −1.6417E−02 −4.6885E−02 −2.3213E−02 −3.1824E−02 −4.5232E−02 2.6258E−02 A8=  8.4071E−03  1.1271E−01  8.2872E−02 −4.5687E−03 8.1980E−02 −5.5389E−02 A10= −1.0182E−02 −7.5986E−02 −4.8074E−02 2.3180E−02 −5.1736E−02  1.4472E−01 A12=  2.5311E−03  1.5785E−02 5.9742E−03 −9.8772E−03  2.1854E−02 −1.3090E−01 A14=  6.9747E−05−4.0277E−03  4.6522E−02 Surface # 8 9 11 12 13 14 k= −1.6787E+01 9.0000E+01  4.2796E+01 −2.1561E+01  9.2270E+00 −1.1971E+00 A4=−2.0063E−02 −1.7117E−02 −1.8856E−01 −3.6612E−01 −2.6363E−01  2.1795E−01A6= −4.6782E−02 −9.7268E−02  8.1209E−02  9.3632E−01  1.4858E+00−3.5621E−01 A8=  3.2844E−02  1.2930E−01 −9.9971E−02 −2.0270E+00−3.2684E+00  4.2151E−01 A10= −3.8924E−02 −1.6023E−01 −1.1909E−02 2.2815E+00  3.7290E+00 −3.2367E−01 A12=  2.5612E−02  9.9797E−02 1.5529E−01 −1.3704E+00 −2.3479E+00  1.4055E−01 A14= −3.0798E−03−2.4716E−02 −1.4019E−01  4.1330E−01  7.7303E−01 −3.0273E−02 A16= 4.0116E−02 −4.8441E−02 −1.0435E−01  2.4202E−03 Surface # 15 16 17 18 k=−2.1723E+00 −1.4325E+01 −6.8662E+00 −7.1427E+00 A4=  2.3237E−01 9.1735E−02 −4.5860E−01 −2.0920E−01 A6= −6.1880E−01 −1.9923E−01 3.0887E−01  1.1355E−01 A8=  7.2908E−01  1.4721E−01 −2.0552E−01−3.8589E−02 A10= −5.9410E−01 −7.0472E−02  1.2280E−01  2.5904E−03 A12= 3.2192E−01  2.0536E−02 −4.9033E−02  4.0231E−03 A14= −1.1330E−01−3.1933E−03  1.2089E−02 −1.9055E−03 A16=  2.3351E−02  2.0136E−04−1.7803E−03  4.0270E−04 A18= −2.0978E−03  1.4424E−04 −4.2922E−05 A20=−4.9635E−06  1.8691E−06

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 10th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 4.06 |f/fi|max 1.11 Fno 1.63 (f/f2) + (f/f3) 0.06HFOV [deg.] 39.7 CTf [mm] 0.21 Nmax 1.671 TL [mm] 5.08 Nmin 1.544 TL/f1.25 (V2 + V6)/V1 2.00 TL/ImgH 1.57 |(V2 − V3)/(V4 − V5)| 1.03 SD/TD0.79 (V4 + V5 + V6)/V1 2.36 Y11/Y82 0.62 ATmax/CTmin 2.51 HFOV × EPD/f24.34 ATmax/ImgH 0.18 TL/ImgH + f/EPD 3.20 (R11 − R12)/(R11 + R12) 0.45TL{circumflex over ( )}2/(ImgH × EPD) 3.20 f/R16 3.07 f/fG1 0.88 EPD/ΣCT0.91 f/fG2 −0.24 EPD/BL 2.48 f/fG3 0.04 TL/EPD 2.04 Yc71/f 0.23 f/EPD1.63 Yc72/f 0.25 f1/f2 1.39 Yc81/f 0.09 f/f2 0.53 Yc82/f 0.23

In the image capturing optical assembly according to the 10thembodiment, the focal length of the image capturing optical assembly isf, a curvature radius of an object-side surface of one of the lenselements of the image capturing optical assembly is Rf, and a curvatureradius of an image-side surface of the lens element of the imagecapturing optical assembly is Rr, and the value of the condition|f/Rf|+|f/Rr| corresponding to each of the first lens element 1010through the eighth lens element 1080 is stated in the following table,wherein term definitions of the parameters related to each surface ofthe lens elements are the same as those of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

10th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.52 |f/Rf| + |f/R9| + |f/R10|0.68 |f/Rr| |f/R3| + |f/R4| 1.74 |f/Rr| |f/R11| + |f/R12| 3.47 |f/R5| +|f/R6| 0.69 |f/R13| + |f/R14| 1.73 |f/R7| + |f/R8| 1.21 |f/R15| +|f/R16| 4.02

In the 10th embodiment, each of three of the first lens element 1010,the second lens element 1020, the third lens element 1030, the fourthlens element 1040, the fifth lens element 1050, the sixth lens element1060, the seventh lens element 1070, and the eighth lens element 1080has an Abbe number smaller than 24.0 and 23.0; in detail, the three lenselements are the third lens element 1030, the fifth lens element 1050and the seventh lens element 1070, wherein each of the Abbe numbers ofthe third lens element 1030 and the seventh lens element 1070 is smallerthan 20.

In the 10th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element1010, the second lens element 1020, the third lens element 1030, thefourth lens element 1040, the fifth lens element 1050, the sixth lenselement 1060, the seventh lens element 1070 and the eighth lens element1080 are listed in the table below. Moreover, in the 10th embodiment, atotal number of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=18.

10th Embodiment - numbers of the inflection points 1010 1020 1030 10401050 1060 1070 1080 Object-side 1 1 1 2 0 0 1 2 surface Image-side 2 1 00 2 2 1 2 surface

11th Embodiment

FIG. 21 is a schematic view of an imaging apparatus according to the11th embodiment of the present disclosure. FIG. 22 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimaging apparatus according to the 11th embodiment. In FIG. 21, theimaging apparatus includes an image capturing optical assembly (itsreference numeral is omitted) and an image sensor 1196. The imagecapturing optical assembly includes, in order from an object side to animage side, a first lens element 1110, an aperture stop 1100, a secondlens element 1120, a third lens element 1130, a fourth lens element1140, a stop 1101, a fifth lens element 1150, a sixth lens element 1160,a seventh lens element 1170, an eighth lens element 1180, a filter 1190and an image surface 1195, wherein the image sensor 1196 is disposed onthe image surface 1195 of the image capturing optical assembly. Theimage capturing optical assembly includes eight lens elements (1110,1120, 1130, 1140, 1150, 1160, 1170 and 1180) without additional one ormore lens elements inserted between the first lens element 1110 and theeighth lens element 1180, and there is an air gap in a paraxial regionbetween every adjacent lens elements of the image capturing opticalassembly. The first lens element 1110 and the second lens element 1120belong to a first lens group (its reference numeral is to omitted). Thethird lens element 1130, the fourth lens element 1140 and the fifth lenselement 1150 belong to a second lens group (its reference numeral isomitted). The sixth lens element 1160, the seventh lens element 1170 andthe eighth lens element 1180 belong to a third lens group (its referencenumeral is omitted).

The first lens element 1110 with positive refractive power has anobject-side surface 1111 being convex and an image-side surface 1112being concave. The first lens element 1110 is made of a plasticmaterial, and has the object-side surface 1111 and the image-sidesurface 1112 being both aspheric. Furthermore, each of the object-sidesurface 1111 and the image-side surface 1112 of the first lens element1110 includes at least one inflection point.

The second lens element 1120 with positive refractive power has anobject-side surface 1121 being convex and an image-side surface 1122being concave. The second lens element 1120 is made of a plasticmaterial, and has the object-side surface 1121 and the image-sidesurface 1122 being both aspheric. Furthermore, each of the object-sidesurface 1121 and the image-side surface 1122 of the second lens element1120 includes at least one inflection point.

The third lens element 1130 with negative refractive power has anobject-side surface 1131 being convex and an image-side surface 1132being concave. The third lens element 1130 is made of a plasticmaterial, and has the object-side surface 1131 and the image-sidesurface 1132 being both aspheric. Furthermore, the object-side surface1131 of the third lens element 1130 includes at least one inflectionpoint.

The fourth lens element 1140 with positive refractive power has anobject-side surface 1141 being convex and an image-side surface 1142being concave. The fourth lens element 1140 is made of a plasticmaterial, and has the object-side surface 1141 and the image-sidesurface 1142 being both aspheric. Furthermore, each of the object-sidesurface 1141 and the image-side surface 1142 of the fourth lens element1140 includes at least one inflection point.

The fifth lens element 1150 with negative refractive power has anobject-side surface 1151 being concave and an image-side surface 1152being concave. The fifth lens element 1150 is made of a plasticmaterial, and has the object-side surface 1151 and the image-sidesurface 1152 being both aspheric. Furthermore, the image-side surface1152 of the fifth lens element 1150 includes at least one inflectionpoint.

The sixth lens element 1160 with positive refractive power has anobject-side surface 1161 being concave and an image-side surface 1162being convex. The sixth lens element 1160 is made of a plastic material,and has the object-side surface 1161 and the image-side surface 1162being both aspheric. Furthermore, the image-side surface 1162 of thesixth lens element 1160 includes at least one inflection point.

The seventh lens element 1170 with positive refractive power has anobject-side surface 1171 being concave and an image-side surface 1172being convex. The seventh lens element 1170 is made of a plasticmaterial, and has the object-side surface 1171 and the image-sidesurface 1172 being both aspheric. Furthermore, each of the object-sidesurface 1171 and the image-side surface 1172 of the seventh lens element1170 includes at least one inflection point and at least one criticalpoint.

The eighth lens element 1180 with negative refractive power has anobject-side surface 1181 being convex and an image-side surface 1182being concave. The eighth lens element 1180 is made of a plasticmaterial, and has the object-side surface 1181 and the image-sidesurface 1182 being both aspheric. Furthermore, each of the object-sidesurface 1181 and the image-side surface 1182 of the eighth lens element1180 includes at least one inflection point and at least one criticalpoint.

The filter 1190 is made of a glass material and located between theeighth lens element 1180 and the image surface 1195, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 11th embodiment are shown in Table 21and the aspheric surface data are shown in Table 22 below.

TABLE 21 11th Embodiment f = 3.98 mm, Fno = 1.58, HFOV = 38.6 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.906 ASP 0.324 Plastic 1.530 55.8 10.462 2.733 ASP 0.288 3 Ape. Stop Plano −0.250 4 Lens 2 2.737 ASP 0.532Plastic 1.535 56.3 6.93 5 9.751 ASP 0.057 6 Lens 3 14.266 ASP 0.230Plastic 1.671 19.5 −9.98 7 4.525 ASP 0.175 8 Lens 4 2.631 ASP 0.357Plastic 1.544 56.0 7.90 9 6.463 ASP −0.027 10 Stop Plano 0.378 11 Lens 5−18.515 ASP 0.300 Plastic 1.660 20.4 −10.21 12 10.669 ASP 0.077 13 Lens6 −4.463 ASP 0.510 Plastic 1.544 56.0 4.15 14 −1.560 ASP 0.087 15 Lens 7−886.211 ASP 0.409 Plastic 1.660 20.4 100.43 16 −61.679 ASP 0.360 17Lens 8 4.254 ASP 0.344 Plastic 1.535 56.3 −3.16 18 1.176 ASP 0.400 19Filter Plano 0.210 Plastic 1.544 56.0 — 20 Plano 0.320 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 10 is 1.160 mm.

TABLE 22 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −6.2200E−01−1.1154E+00 2.0715E+00 5.3216E+01 7.4686E+01 −2.0955E+01  A4=−7.0102E−03  4.8963E−02 4.8635E−02 3.6335E−02 8.8965E−03 −3.0694E−02 A6= −5.5833E−03 −2.7855E−01 −2.6057E−01  −2.0181E−01  −1.3695E−01 1.5561E−03 A8= −2.5414E−02  3.5390E−01 3.4112E−01 1.8333E−01 1.7252E−014.8772E−02 A10=  2.3810E−02 −1.8535E−01 −1.7028E−01  −7.1143E−02 −8.5806E−02  −3.1655E−02  A12= −1.2296E−02  3.4566E−02 2.8099E−029.0012E−03 1.9841E−02 1.5027E−03 A14=  2.4722E−03 −3.7080E−04 6.2432E−03 Surface # 8 9 11 12 13 14 k= −1.2251E+01 −8.2246E−01 4.2796E+01  3.8977E+01  9.2837E+00 −9.0251E−01 A4=  1.2946E−02−1.8018E−02 −2.2280E−01 −3.4769E−01 −2.0181E−01  1.8893E−01 A6=−3.0840E−02 −1.7519E−02  2.3945E−01  9.4056E−01  1.1466E+00 −3.4930E−01A8= −4.4962E−02 −3.3900E−02 −5.3789E−01 −2.0253E+00 −2.5879E+00 3.3559E−01 A10=  6.9357E−02  2.1435E−02  6.9227E−01  2.2819E+00 2.9627E+00 −1.4887E−01 A12= −6.4515E−02 −2.1916E−02 −4.7473E−01−1.3702E+00 −1.8320E+00  3.6933E−03 A14=  2.4185E−02  8.6847E−03 1.4839E−01  4.1327E−01  5.8001E−01  1.8131E−02 A16= −1.4158E−02−4.8576E−02 −7.3179E−02 −3.9946E−03 Surface # 15 16 17 18 k= 9.0000E+01−9.0000E+01 −4.6272E+00 −6.8156E+00 A4= 2.6141E−01  1.2168E−01−4.4110E−01 −1.8251E−01 A6= −6.2028E−01  −2.0132E−01  3.5232E−01 1.2979E−01 A8= 7.3115E−01  1.4629E−01 −1.9124E−01 −6.2378E−02 A10=−5.9334E−01  −7.0598E−02  5.6078E−02  1.8220E−02 A12= 3.2180E−01 2.0528E−02 −2.0232E−03 −2.8624E−03 A14= −1.1344E−01  −3.1916E−03−3.6500E−03  1.2493E−04 A16= 2.3298E−02  2.0270E−04  1.0660E−03 2.9463E−05 A18= −2.1203E−03  −1.2429E−04 −4.6422E−06 A20=  5.4327E−06 2.0448E−07

In the 11th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 11th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22as the following values and satisfy the following conditions:

11th Embodiment f [mm] 3.98 |f/fi|max 1.26 Fno 1.58 (f/f2) + (f/f3) 0.18HFOV [deg.] 38.6 CTf [mm] 0.21 Nmax 1.671 TL [mm] 5.08 Nmin 1.530 TL/f1.28 (V2 + V6)/V1 2.01 TL/ImgH 1.59 |(V2 − V3)/(V4 − V5)| 1.03 SD/TD0.85 (V4 + V5 + V6)/V1 2.37 Y11/Y82 0.54 ATmax/CTmin 1.57 HFOV × EPD/f24.40 ATmax/ImgH 0.11 TL/ImgH + f/EPD 3.17 (R11 − R12)/(R11 + R12) 0.48TL{circumflex over ( )}2/(ImgH × EPD) 3.20 f/R16 3.39 f/fG1 0.93 EPD/ΣCT0.84 f/fG2 −0.28 EPD/BL 2.71 f/fG3 0.003 TL/EPD 2.01 Yc71/f 0.01\0.20f/EPD 1.58 Yc72/f 0.05\0.21 f1/f2 1.51 Yc81/f 0.10 f/f2 0.57 Yc82/f 0.29

In the image capturing optical assembly according to the 11thembodiment, the focal length of the image capturing optical assembly isf, a curvature radius of an object-side surface of one of the lenselements of the image capturing optical assembly is Rf, and a curvatureradius of an image-side surface of the lens element of the imagecapturing optical assembly is Rr, and the value of the condition|f/Rf|+|f/Rr| corresponding to each of the first lens element 1110through the eighth lens element 1180 is stated in the following table,wherein term definitions of the parameters related to each surface ofthe lens elements are the same as those of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

11th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.55 |f/Rf| + |f/R9| + |f/R10|0.59 |f/Rr| |f/R3| + |f/R4| 1.86 |f/Rr| |f/R11| + |f/R12| 3.45 |f/R5| +|f/R6| 1.16 |f/R13| + |f/R14| 0.07 |f/R7| + |f/R8| 2.13 |f/R15| +|f/R16| 4.32

In the 11th embodiment, each of three of the first lens element 1110,the second lens element 1120, the third lens element 1130, the fourthlens element 1140, the fifth lens element 1150, the sixth lens element1160, the seventh lens element 1170, and the eighth lens element 1180has an Abbe number smaller than 24.0 and 23.0; in detail, the three lenselements are the third lens element 1130, the fifth lens element 1150and the seventh lens element 1170, wherein the Abbe number of the thirdlens element 1130 is smaller than 20.

In the 11th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element1110, the second lens element 1120, the third lens element 1130, thefourth lens element 1140, the fifth lens element 1150, the sixth lenselement 1160, the seventh lens element 1170 and the eighth lens element1180 are listed in the table below. Moreover, in the 11th embodiment, atotal number of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=19.

11th Embodiment - numbers of the inflection points 1110 1120 1130 11401150 1160 1170 1180 Object-side 1 1 2 1 0 0 2 2 surface Image-side 1 1 01 2 2 2 1 surface

12th Embodiment

FIG. 23 is a schematic view of an imaging apparatus according to the12th embodiment of the present disclosure. FIG. 24 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimaging apparatus according to the 12th embodiment. In FIG. 23, theimaging apparatus includes an image capturing optical assembly (itsreference numeral is omitted) and an image sensor 1296. The imagecapturing optical assembly includes, in order from an object side to animage side, a first lens element 1210, an aperture stop 1200, a secondlens element 1220, a third lens element 1230, a fourth lens element1240, a stop 1201, a fifth lens element 1250, a sixth lens element 1260,a seventh lens element 1270, an eighth lens element 1280, a filter 1290and an image surface 1295, wherein the image sensor 1296 is disposed onthe image surface 1295 of the image capturing optical assembly. Theimage capturing optical assembly includes eight lens elements (1210,1220, 1230, 1240, 1250, 1260, 1270 and 1280) without additional one ormore lens elements inserted between the first lens element 1210 and theeighth lens element 1280, and there is an air gap in a paraxial regionbetween every adjacent lens elements of the image capturing opticalassembly. The first lens element 1210 and the second lens element 1220belong to a first lens group (its reference numeral is omitted). Thethird lens element 1230, the fourth lens element 1240 and the fifth lenselement 1250 belong to a second lens group (its reference numeral isomitted). The sixth lens element 1260, the seventh lens element 1270 andthe eighth lens element 1280 belong to a third lens group (its referencenumeral is omitted).

The first lens element 1210 with positive refractive power has anobject-side surface 1211 being convex and an image-side surface 1212being concave. The first lens element 1210 is made of a plasticmaterial, and has the object-side surface 1211 and the image-sidesurface 1212 being both aspheric. Furthermore, each of the object-sidesurface 1211 and the image-side surface 1212 of the first lens element1210 includes at least one inflection point.

The second lens element 1220 with positive refractive power has anobject-side surface 1221 being convex and an image-side surface 1222being concave. The second lens element 1220 is made of a plasticmaterial, and has the object-side surface 1221 and the image-sidesurface 1222 being both aspheric. Furthermore, each of the object-sidesurface 1221 and the image-side surface 1222 of the second lens element1220 includes at least one inflection point.

The third lens element 1230 with negative refractive power has anobject-side surface 1231 being convex and an image-side surface 1232being concave. The third lens element 1230 is made of a plasticmaterial, and has the object-side surface 1231 and the image-sidesurface 1232 being both aspheric. Furthermore, the object-side surface1231 of the third lens element 1230 includes at least one inflectionpoint.

The fourth lens element 1240 with positive refractive power has anobject-side surface 1241 being convex and an image-side surface 1242being concave. The fourth lens element 1240 is made of a plasticmaterial, and has the object-side surface 1241 and the image-sidesurface 1242 being both aspheric. Furthermore, each of the object-sidesurface 1241 and the image-side surface 1242 of the fourth lens element1240 includes at least one inflection point.

The fifth lens element 1250 with negative refractive power has anobject-side surface 1251 being convex and an image-side surface 1252being concave. The fifth lens element 1250 is made of a plasticmaterial, and has the object-side surface 1251 and the image-sidesurface 1252 being both aspheric. Furthermore, each of the object-sidesurface 1251 and the image-side surface 1252 of the fifth lens element1250 includes at least one inflection point.

The sixth lens element 1260 with positive refractive power has anobject-side surface 1261 being concave and an image-side surface 1262being convex. The sixth lens element 1260 is made of a plastic material,and has the object-side surface 1261 and the image-side surface 1262being both aspheric. Furthermore, the image-side surface 1262 of thesixth lens element 1260 includes at least one inflection point.

The seventh lens element 1270 with negative refractive power has anobject-side surface 1271 being concave and an image-side surface 1272being convex. The seventh lens element 1270 is made of a plasticmaterial, and has the object-side surface 1271 and the image-sidesurface 1272 being both aspheric. Furthermore, each of the object-sidesurface 1271 and the image-side surface 1272 of the seventh lens element1270 includes at least one inflection point and at least one criticalpoint.

The eighth lens element 1280 with negative refractive power has anobject-side surface 1281 being convex and an image-side surface 1282being concave. The eighth lens element 1280 is made of a plasticmaterial, and has the object-side surface 1281 and the image-sidesurface 1282 being both aspheric. Furthermore, each of the object-sidesurface 1281 and the image-side surface 1282 of the eighth lens element1280 includes at least one inflection point and at least one criticalpoint.

The filter 1290 is made of a glass material and located between theeighth lens element 1280 and the image surface 1295, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 12th embodiment are shown in Table 23and the aspheric surface data are shown in Table 24 below.

TABLE 23 12th Embodiment f = 5.15 mm, Fno = 1.54, HFOV = 39.3 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.514 ASP 0.313 Plastic 1.530 55.8 16.062 3.413 ASP 0.433 3 Ape. Stop Plano −0.325  4 Lens 2 3.430 ASP 0.700Plastic 1.535 56.3 8.50 5 12.995 ASP 0.066 6 Lens 3 19.991 ASP 0.230Plastic 1.671 19.5 −12.82 7 5.985 ASP 0.248 8 Lens 4 2.866 ASP 0.371Plastic 1.544 56.0 11.55 9 5.030 ASP 0.036 10 Stop Plano 0.497 11 Lens 5129.455 ASP 0.300 Plastic 1.660 20.4 −17.77 12 10.742 ASP 0.087 13 Lens6 −5.811 ASP 0.601 Plastic 1.544 56.0 5.24 14 −1.981 ASP 0.337 15 Lens 7−15.034 ASP 0.530 Plastic 1.660 20.4 −27.20 16 −93.901 ASP 0.360 17 Lens8 5.423 ASP 0.655 Plastic 1.535 56.3 −4.78 18 1.664 ASP 0.520 19 FilterPlano 0.210 Glass 1.517 64.2 — 20 Plano 0.373 21 Image Plano — Referencewavelength is 587.6 nm (d-line). Effective radius of the stop on Surface10 is 1.540 mm.

TABLE 24 Aspheric Coefficients Surface # 1 2 4 5 6 7 k= −6.6633E−01−9.7125E−01 2.0543E+00  5.3216E+01 7.8644E+01 −2.2575E+01 A4= 1.3027E−03  1.6921E−02 1.4202E−02 −4.4904E−03 −2.9366E−02  −4.2209E−02A6= −1.1392E−02 −4.8484E−02 −4.0109E−02  −1.5007E−02 3.1071E−02 5.4053E−02 A8=  3.1017E−03  3.2988E−02 2.9848E−02  9.9120E−04−2.7596E−02  −3.7235E−02 A10= −5.6550E−04 −9.8515E−03 −8.5209E−03  2.4335E−03 1.3292E−02  1.6315E−02 A12= −7.7201E−05  1.0727E−037.3410E−04 −6.0622E−04 −2.4613E−03  −3.4984E−03 A14=  2.7860E−051.3970E−04  3.9498E−04 Surface # 8 9 11 12 13 14 k= −1.1432E+01−5.5570E+00  4.2796E+01  2.0559E+01  9.3510E+00 −8.7089E−01 A4= 7.8521E−03 −6.0229E−03 −1.1821E−01 −1.6205E−01 −4.2753E−02  9.4986E−02A6= −9.7715E−03 −1.2755E−02  7.9211E−02  2.5311E−01  2.2866E−01−9.8505E−02 A8= −2.5535E−03  9.3099E−03 −8.3018E−02 −3.2280E−01−3.4620E−01  5.4376E−02 A10= −6.7212E−04 −1.1510E−02  5.1991E−02 2.1519E−01  2.4711E−01 −1.5946E−02 A12=  7.9918E−04  4.9664E−03−1.8492E−02 −7.6447E−02 −9.2786E−02  1.6380E−03 A14= −4.3740E−05−7.4607E−04  3.2017E−03  1.3647E−02  1.7678E−02  2.1726E−04 A16=−1.8378E−04 −9.4854E−04 −1.3415E−03 −4.3240E−05 Surface # 15 16 17 18 k=−8.2435E+01 −9.0000E+01 −3.8430E+00 −7.7071E+00 A4=  1.2690E−01 4.5484E−02 −1.9948E−01 −5.9989E−02 A6= −1.6808E−01 −5.2025E−02 1.0579E−01  2.1113E−02 A8=  1.1598E−01  2.3330E−02 −5.0978E−02−5.1986E−03 A10= −5.5977E−02 −6.6821E−03  1.9608E−02  7.9856E−04 A12= 1.7978E−02  1.1420E−03 −5.1803E−03 −6.3840E−05 A14= −3.7392E−03−1.0553E−04  8.9321E−04  4.5237E−07 A16=  4.5524E−04  3.9941E−06−9.6040E−05  3.5257E−07 A18= −2.5336E−05  5.8252E−06 −2.6434E−08 A20=−1.5148E−07  6.2584E−10

In the 12th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 12th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24as the following values and satisfy the following conditions:

12th Embodiment f [mm] 5.15 |f/fi|max 1.08 Fno 1.54 (f/f2) + (f/f3) 0.20HFOV [deg.] 39.3 CTf [mm] 0.21 Nmax 1.671 TL [mm] 6.54 Nmin 1.530 TL/f1.27 (V2 + V6)/V1 2.01 TL/ImgH 1.52 |(V2 − V3)/(V4 − V5)| 1.03 SD/TD0.86 (V4 + V5 + V6)/V1 2.37 Y11/Y82 0.52 ATmax/CTmin 2.32 HFOV × EPD/f25.51 ATmax/ImgH 0.12 TL/ImgH + f/EPD 3.06 (R11 − R12)/(R11 + R12) 0.49TL{circumflex over ( )}2/(ImgH × EPD) 2.98 f/R16 3.09 f/fG1 0.90 EPD/ΣCT0.90 f/fG2 −0.24 EPD/BL 3.03 f/fG3 −0.03 TL/EPD 1.96 Yc71/f 0.08\0.18f/EPD 1.54 Yc72/f 0.05\0.18 f1/f2 1.89 Yc81/f 0.10 f/f2 0.61 Yc82/f 0.32

In the image capturing optical assembly according to the 12thembodiment, the focal length of the image capturing optical assembly isf, a curvature radius of an object-side surface of one of the lenselements of the image capturing optical assembly is Rf, and a curvatureradius of an image-side surface of the lens element of the imagecapturing optical assembly is Rr, and the value of the condition|f/Rf|+|f/Rr| corresponding to each of the first lens element 1210through the eighth lens element 1280 is stated in the following table,wherein term definitions of the parameters related to each surface ofthe lens elements are the same as those of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

12th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.55 |f/Rf| + |f/R9| + |f/R10|0.52 |f/Rr| |f/R3| + |f/R4| 1.90 |f/Rr| |f/R11| + |f/R12| 3.48 |f/R5| +|f/R6| 1.12 |f/R13| + |f/R14| 0.40 |f/R7| + |f/R8| 2.82 |f/R15| +|f/R16| 4.04

In the 12th embodiment, each of three of the first lens element 1210,the second lens element 1220, the third lens element 1230, the fourthlens element 1240, the fifth lens element 1250, the sixth lens element1260, the seventh lens element 1270, and the eighth lens element 1280has an Abbe number smaller than 24.0 and 23.0; in detail, the three lenselements are the third lens element 1230, the fifth lens element 1250and the seventh lens element 1270, wherein the Abbe number of the thirdlens element 1230 is smaller than 20.

In the 12th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element1210, the second lens element 1220, the third lens element 1230, thefourth lens element 1240, the fifth lens element 1250, the sixth lenselement 1260, the seventh lens element 1270 and the eighth lens element1280 are listed in the table below. Moreover, in the 12th embodiment, atotal number of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=24.

12th Embodiment - numbers of the inflection points 1210 1220 1230 12401250 1260 1270 1280 Object-side 1 2 2 0 0 3 4 4 surface Image-side 2 0 12 2 4 3 4 surface

13th Embodiment

FIG. 25 is a schematic view of an imaging apparatus according to the13th embodiment of the present disclosure. FIG. 26 shows sphericalaberration curves, astigmatic field curves and a distortion curve of theimaging apparatus according to the 13th embodiment. In FIG. 25, theimaging apparatus includes an image capturing optical assembly (itsreference numeral is omitted) and an image sensor 1396. The imagecapturing optical assembly includes, in order from an object side to animage side, an aperture stop 1300, a first lens element 1310, a secondlens element 1320, a third lens element 1330, a stop 1301, a fourth lenselement 1340, a fifth lens element 1350, a sixth lens element 1360, aseventh lens element 1370, an eighth lens element 1380, a filter 1390and an image surface 1395, wherein the image sensor 1396 is disposed onthe image surface 1395 of the image capturing optical assembly. Theimage capturing optical assembly includes eight lens elements (1310,1320, 1330, 1340, 1350, 1360, 1370 and 1380) without additional one ormore lens elements inserted between the first lens element 1310 and theeighth lens element 1380, and there is an air gap in a paraxial regionbetween every adjacent lens elements of the image capturing opticalassembly. The first lens element 1310 and the second lens element 1320belong to a first lens group (its reference numeral is omitted). Thethird lens element 1330, the fourth lens element 1340 and the fifth lenselement 1350 belong to a second lens group (its reference numeral isomitted). The sixth lens element 1360, the seventh lens element 1370 andthe eighth lens element 1380 belong to a third lens group (its referencenumeral is omitted).

The first lens element 1310 with positive refractive power has anobject-side surface 1311 being convex and an image-side surface 1312being concave. The first lens element 1310 is made of a plasticmaterial, and has the object-side surface 1311 and the image-sidesurface 1312 being both aspheric. Furthermore, each of the object-sidesurface 1311 and the image-side surface 1312 of the first lens element1310 includes at least one inflection point.

The second lens element 1320 with negative refractive power has anobject-side surface 1321 being convex and an image-side surface 1322being concave. The second lens element 1320 is made of a plasticmaterial, and has the object-side surface 1321 and the image-sidesurface 1322 being both aspheric. Furthermore, the object-side surface1321 of the second lens element 1320 includes at least one inflectionpoint.

The third lens element 1330 with positive refractive power has anobject-side surface 1331 being convex and an image-side surface 1332being concave. The third lens element 1330 is made of a plasticmaterial, and has the object-side surface 1331 and the image-sidesurface 1332 being both aspheric. Furthermore, each of the object-sidesurface 1331 and the image-side surface 1332 of the third lens element1330 includes at least one inflection point.

The fourth lens element 1340 with negative refractive power has anobject-side surface 1341 being concave and an image-side surface 1342being concave. The fourth lens element 1340 is made of a plasticmaterial, and has the object-side surface 1341 and the image-sidesurface 1342 being both aspheric. Furthermore, the image-side surface1342 of the fourth lens element 1340 includes at least one inflectionpoint.

The fifth lens element 1350 with positive refractive power has anobject-side surface 1351 being concave and an image-side surface 1352being convex. The fifth lens element 1350 is made of a plastic material,and has the object-side surface 1351 and the image-side surface 1352being both aspheric. Furthermore, the image-side surface 1352 of thefifth lens element 1350 includes at least one inflection point.

The sixth lens element 1360 with negative refractive power has anobject-side surface 1361 being convex and an image-side surface 1362being concave. The sixth lens element 1360 is made of a plasticmaterial, and has the object-side surface 1361 and the image-sidesurface 1362 being both aspheric. Furthermore, each of the object-sidesurface 1361 and the image-side surface 1362 of the sixth lens element1360 includes at least one inflection point.

The seventh lens element 1370 with negative refractive power has anobject-side surface 1371 being convex and an image-side surface 1372being concave. The seventh lens element 1370 is made of a plasticmaterial, and has the object-side surface 1371 and the image-sidesurface 1372 being both aspheric. Furthermore, each of the object-sidesurface 1371 and the image-side surface 1372 of the seventh lens element1370 includes at least one inflection point and at least one criticalpoint.

The eighth lens element 1380 with negative refractive power has anobject-side surface 1381 being concave and an image-side surface 1382being convex. The eighth lens element 1380 is made of a plasticmaterial, and has the object-side surface 1381 and the image-sidesurface 1382 being both aspheric. Furthermore, each of the object-sidesurface 1381 and the image-side surface 1382 of the eighth lens element1380 includes at least one inflection point.

The filter 1390 is made of a glass material and located between theeighth lens element 1380 and the image surface 1395, and will not affectthe focal length of the image capturing optical assembly.

The detailed optical data of the 13th embodiment are shown in Table 25and the aspheric surface data are shown in Table 26 below.

TABLE 25 13th Embodiment f = 4.96 mm, Fno = 1.39, HFOV = 40.8 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.547  2 Lens 1 2.446 ASP 0.897Plastic 1.535 55.8 8.39 3 4.691 ASP 0.072 4 Lens 2 3.395 ASP 0.200Plastic 1.660 20.4 −18.60 5 2.597 ASP 0.214 6 Lens 3 2.855 ASP 0.535Plastic 1.544 56.0 8.12 7 7.530 ASP 0.057 8 Stop Plano 0.418 9 Lens 4−115.559 ASP 0.372 Plastic 1.660 20.4 −17.84 10 13.126 ASP 0.134 11 Lens5 −5.593 ASP 0.581 Plastic 1.544 56.0 6.02 12 −2.140 ASP 0.056 13 Lens 65.706 ASP 0.484 Plastic 1.639 23.5 −44.62 14 4.597 ASP 0.651 15 Lens 73.036 ASP 0.425 Plastic 1.535 55.8 −7.66 16 1.658 ASP 0.328 17 Lens 8−24.870 ASP 0.500 Plastic 1.535 55.8 −50.73 18 −299.471 ASP 0.250 19Filter Plano 0.190 Glass 1.517 64.2 — 20 Plano 0.148 21 Image Plano —Reference wavelength is 587.6 nm (d-line). Effective radius of the stopon Surface 8 is 1.500 mm.

TABLE 26 Aspheric Coefficients Surface # 2 3 4 5 6 7 k= −1.0945E−01−1.0561E+00 −3.3831E+01 −1.1974E+01 −7.6708E+00 9.4532E+00 A4= 1.4287E−03 −1.0312E−02  3.4384E−02  3.2438E−03  1.1063E−02 −1.3664E−02 A6= −2.8614E−03 −3.9103E−02 −9.9611E−02 −2.5075E−02 −7.4225E−033.6719E−03 A8= −6.6898E−04  2.2185E−02  8.3065E−02  2.5946E−02−3.3831E−03 −1.4047E−02  A10=  1.2461E−03 −5.3361E−03 −3.2881E−02−5.2001E−03  4.3835E−03 8.4231E−03 A12= −7.7013E−04  4.6294E−04 7.0643E−03 −1.3625E−03 −2.4311E−03 −3.0067E−03  A14=  1.0669E−04−6.4050E−04  5.6365E−04  5.1549E−04 4.2951E−04 Surface # 9 10 11 12 1314 k= −9.0000E+01  5.1885E+01 9.3261E+00 −1.1112E+00 1.4104E+00−5.4455E+00 A4= −8.1596E−02 −1.5310E−01 −1.2662E−01   7.2869E−021.0282E−01  3.4953E−02 A6=  3.6332E−02  2.5493E−01 4.1664E−01−6.5701E−02 −1.6673E−01  −5.3413E−02 A8= −5.6980E−02 −3.2282E−01−5.3134E−01   3.6398E−02 1.1659E−01  2.3595E−02 A10=  4.0396E−02 2.1508E−01 3.7202E−01 −1.1207E−02 −5.5997E−02  −6.6379E−03 A12=−1.0501E−02 −7.6516E−02 −1.5372E−01   1.4547E−03 1.7962E−02  1.1459E−03A14= −3.5338E−04  1.3636E−02 3.7755E−02  7.8266E−05 −3.7406E−03 −1.0549E−04 A16=  3.8684E−04 −9.4590E−04 −5.2127E−03  −2.7057E−054.5628E−04  3.9184E−06 A18= −1.0182E−06 3.2041E−04 −2.4215E−05  Surface# 15 16 17 18 k= −9.2287E+00 −4.5896E+00 −9.0000E+01 5.8557E+01 A4=−1.3299E−01 −9.5422E−02 −1.2459E−02 3.1037E−03 A6=  5.5330E−02 4.3221E−02  8.6885E−03 −5.6622E−03  A8= −3.0776E−02 −1.8071E−02−3.6215E−03 3.0212E−03 A10=  1.3296E−02  5.3414E−03  8.2781E−04−8.7741E−04  A12= −3.4432E−03 −9.9563E−04 −1.0822E−04 1.4427E−04 A14= 5.3473E−04  1.1505E−04  8.2471E−06 −1.3809E−05  A16= −4.9282E−05−8.0684E−06 −3.5809E−07 7.6308E−07 A18=  2.4899E−06  3.1694E−07 8.1113E−09 −2.2572E−08  A20= −5.3142E−08 −5.3772E−09 −7.3741E−112.7652E−10

In the 13th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment andthe 2nd embodiment with corresponding values for the 13th embodiment, soan explanation in this regard will not be provided again.

Moreover, these parameters can be calculated from Table 25 and Table 26as the following values and satisfy the following conditions:

13th Embodiment f [mm] 4.96 |f/fi|max 0.83 Fno 1.39 (f/f2) + (f/f3) 0.34HFOV [deg.] 40.8 CTf [mm] 0.19 Nmax 1.660 TL [mm] 6.51 Nmin 1.535 TL/f1.31 (V2 + V6)/V1 0.79 TL/ImgH 1.48 |(V2 − V3)/(V4 − V5)| 1.00 SD/TD0.91 (V4 + V5 + V6)A/1 1.79 Y11/Y82 0.44 ATmax/CTmin 3.26 HFOV × EPD/f29.32 ATmax/ImgH 0.15 TL/ImgH + f/EPD 2.87 (R11 − R12)/(R11 + R12) 0.11TL{circumflex over ( )}2/(ImgH × EPD) 2.70 f/R16 −0.02 f/fG1 0.38EPD/ΣCT 0.89 f/fG2 1.03 EPD/BL 6.07 f/fG3 −0.85 TL/EPD 1.82 Yc71/f 0.17f/EPD 1.39 Yc72/f 0.28 f1/f2 −0.45 Yc81/f — f/f2 −0.27 Yc82/f —

In the image capturing optical assembly according to the 13thembodiment, the focal length of the image capturing optical assembly isf, a curvature radius of an object-side surface of one of the lenselements of the image capturing optical assembly is Rf, and a curvatureradius of an image-side surface of the lens element of the imagecapturing optical assembly is Rr, and the value of the condition|f/Rf|+|f/Rr| corresponding to each of the first lens element 1310through the eighth lens element 1380 is stated in the following table,wherein term definitions of the parameters related to each surface ofthe lens elements are the same as those of the 1st embodiment.Therefore, an explanation in this regard will not be provided again.

13th Embodiment |f/Rf| + |f/R1| + |f/R2| 3.09 |f/Rf| + |f/R9| + |f/R10|3.21 |f/Rr| |f/R3| + |f/R4| 3.37 |f/Rr| |f/R11| + |f/R12| 1.95 |f/R5| +|f/R6| 2.40 |f/R13| + |f/R14| 4.63 |f/R7| + |f/R8| 0.42 |f/R15| +|f/R16| 0.22

In the 13th embodiment, each of three of the first lens element 1310,the second lens element 1320, the third lens element 1330, the fourthlens element 1340, the fifth lens element 1350, the sixth lens element1360, the seventh lens element 1370, and the eighth lens element 1380has an Abbe number smaller than 24.0; in detail, the three lens elementsare the second lens element 1320, the fourth lens element 1340 and thesixth lens element 1360, wherein each of the Abbe numbers of the secondlens element 1320 and the fourth lens element 1340 is smaller than 23.0.

In the 13th embodiment, the numbers of the inflection points ofobject-side surfaces and image-side surfaces of the first lens element1310, the second lens element 1320, the third lens element 1330, thefourth lens element 1340, the fifth lens element 1350, the sixth lenselement 1360, the seventh lens element 1370, and the eighth lens element1380 are listed in the table below. Moreover, in the 13th embodiment, atotal number of inflection points on the object-side surfaces and theimage-side surfaces of all the lens elements of the image capturingoptical assembly is Ninf., the following condition is satisfied:Ninf.=33.

13th Embodiment - numbers of the inflection points 1310 1320 1330 13401350 1360 1370 1380 Object-side 1 2 2 0 0 3 4 4 surface Image-side 1 0 12 2 4 3 4 surface

14th Embodiment

FIG. 29 is a three-dimensional schematic view of an imaging apparatus 10according to the 14th embodiment of the present disclosure. In FIG. 29,the imaging apparatus 10 of the 14th embodiment is a camera module, theimaging apparatus 10 includes an imaging lens assembly 11, a drivingapparatus 12 and an image sensor 13, wherein the imaging lens assembly11 includes the image capturing optical assembly of the 1st embodimentand a lens barrel (not shown in drawings) for carrying the imagecapturing optical assembly. The imaging apparatus 10 can focus lightfrom an imaged object via the imaging lens assembly 11, perform imagefocusing by the driving apparatus 12, and generate an image on the imagesensor 13, and the imaging information can be transmitted.

The driving apparatus 12 can be an auto-focus module, which can bedriven by driving systems, such as voice coil motors (VCM), microelectro-mechanical systems (MEMS), piezoelectric systems, and shapememory alloys etc. The image capturing optical assembly can obtain afavorable imaging position by the driving apparatus 12 so as to captureclear images when the imaged object is disposed at different objectdistances.

The imaging apparatus 10 can include the image sensor 13 located on theimage surface of the image capturing optical assembly, such as CMOS andCCD, with superior photosensitivity and low noise. Thus, it is favorablefor providing realistic images with high definition image qualitythereof.

Moreover, the imaging apparatus 10 can further include an imagestabilization module 14, which can be a kinetic energy sensor, such asan accelerometer, a gyro sensor, and a Hall Effect sensor. In the 14thembodiment, the image stabilization module 14 is a gyro sensor, but isnot limited thereto. Therefore, the variation of different axialdirections of the image capturing optical assembly can adjusted so as tocompensate the image blur generated by motion at the moment of exposure,and it is further favorable for enhancing the image quality whilephotographing in motion and low light situation. Furthermore, advancedimage compensation functions, such as optical image stabilizations (OIS)and electronic image stabilizations (EIS) etc., can be provided.

15th Embodiment

FIG. 30A is a schematic view of one side of an electronic device 20according to the 15th embodiment of the present disclosure. FIG. 30B isa schematic view of another side of the electronic device 20 of FIG.30A. FIG. 30C is a system schematic view of the electronic device 20 ofFIG. 30A. In FIGS. 30A, 30B and 30C, the electronic device 20 accordingto the 15th embodiment is a smartphone, wherein the electronic device 20includes the imaging apparatus 10, a flash module 21, a focusingassisting module 22, an image signal processor 23, a user interface 24and an image software processor 25. When the user captures images of animaged object 26 via the user interface 24, the electronic device 20focuses and generates an image via the imaging apparatus 10 whilecompensating for low illumination via the flash module 21 whennecessary. Then, the electronic device 20 quickly focuses on the imagedobject according to its object distance information provided by thefocusing assisting module 22, and optimizes the image via the imagesignal processor 23 (ISP) and the image software processor 25. Thus, theimage quality can be further enhanced. The focusing assisting module 22can adopt conventional infrared or laser for obtaining quick focusing,and the user interface 24 can utilize a touch screen or a physicalbutton for capturing and processing the image with various functions ofthe image processing software.

The imaging apparatus 10 according to the 15th embodiment is the same asthe imaging apparatus 10 according to the 14th embodiment, and will notdescribe again herein.

16th Embodiment

FIG. 31 is a schematic view of an electronic device 30 according to the16th embodiment of the present disclosure. The electronic device 30 ofthe 16th embodiment is a tablet personal computer, wherein theelectronic device 30 includes an imaging apparatus 31, wherein theimaging apparatus 31 is the same as stated in the 14th embodiment, andwill not describe again herein.

17th Embodiment

FIG. 32 is a schematic view of an electronic device 40 according to the17th embodiment of the present disclosure. The electronic device 40 ofthe 17th embodiment is a wearable device, wherein the electronic device40 includes an imaging apparatus 41, wherein the imaging apparatus 41 isthe same as stated in the 14th embodiment, and will not describe againherein.

The foregoing description, for purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTables show different data of the different embodiments; however, thedata of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. An image capturing optical assembly comprising,in order from an object side to an image side: a first lens group, asecond lens group and a third lens group; wherein the first lens groupcomprises, in order from the object side to the image side, a first lenselement and a second lens element; the second lens group comprises, inorder from the object side to the image side, a third lens element, afourth lens element and a fifth lens element; and the third lens groupcomprises, in order from the object side to the image side, a sixth lenselement, a seventh lens element and an eighth lens element; wherein eachof the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element, the sixth lenselement, the seventh lens element and the eighth lens element has anobject-side surface facing towards the object side and an image-sidesurface facing towards the image side; wherein at least one surface ofat least one of the lens elements of the second lens group is aspheric,and at least one surface of at least one of the lens elements of thethird lens group is aspheric; wherein the image-side surface of theeighth lens element is concave in a paraxial region thereof andcomprises at least one inflection point; wherein at least one of theeight lens elements has an Abbe number smaller than 20; wherein amaximum of refractive indexes of all the lens elements of the imagecapturing optical assembly is Nmax, and the following condition issatisfied:1.30<Nmax<1.75.
 2. The image capturing optical assembly of claim 1,wherein the eighth lens element has negative refractive power; theimage-side surface of the eighth lens element comprises at least onecritical point.
 3. The image capturing optical assembly of claim 1,wherein the image-side surface of the fourth lens element is concave ina paraxial region thereof.
 4. The image capturing optical assembly ofclaim 1, wherein the object-side surface of the first lens elementcomprises at least one inflection point.
 5. The image capturing opticalassembly of claim 1, wherein there are at least two of the eight lenselements with an Abbe number smaller than 23.0; a focal length of theimage capturing optical assembly is f, a focal length of the second lenselement is f2, and the following condition is satisfied:−0.55<f/f2<0.55.
 6. The image capturing optical assembly of claim 1,wherein a curvature radius of the object-side surface of the sixth lenselement is R11, a curvature radius of the image-side surface of thesixth lens element is R12, and the following condition is satisfied:0<(R11−R12)/(R11+R12)<0.80.
 7. The image capturing optical assembly ofclaim 1, wherein a focal length of the image capturing optical assemblyis f, a curvature radius of an object-side surface of one of the lenselements of the image capturing optical assembly is Rf, a curvatureradius of an image-side surface of the lens element of the imagecapturing optical assembly is Rr, and at least one of the lens elementssatisfies the following condition:|f/Rf|+|f/Rr|<0.40.
 8. The image capturing optical assembly of claim 1,wherein a half of a maximum field of view of the image capturing opticalassembly is HFOV, a focal length of the image capturing optical assemblyis f, an entrance pupil diameter of the image capturing optical assemblyis EPD, and the following condition is satisfied:24.0<HFOV×EPD/f<35.0.
 9. The image capturing optical assembly of claim1, wherein an entrance pupil diameter of the image capturing opticalassembly is EPD, a sum of central thicknesses of all the lens elementsof the image capturing optical assembly is ΣCT, and the followingcondition is satisfied:0.80<EPD/ΣCT<2.0.
 10. The image capturing optical assembly of claim 1,wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, a maximum image height of theimage capturing optical assembly is ImgH, a focal length of the imagecapturing optical assembly is f, a focal length of the first lenselement is f1, a focal length of the second lens element is f2, a focallength of the third lens element is f3, a focal length of the fourthlens element is f4, a focal length of the fifth lens element is f5, afocal length of the sixth lens element is f6, a focal length of theseventh lens element is f7, a focal length of the eighth lens element is18, a focal length of i-th lens element is fi, a maximum of |f/fi| is|f/fi|max, and the following conditions are satisfied:0.80<TL/ImgH<1.65; and|f/fi|max<1.50, wherein i=1˜8.
 11. The image capturing optical assemblyof claim 1, wherein a focal length of the image capturing opticalassembly is 1, a curvature radius of the image-side surface of theeighth lens element is R16; the image-side surface of the eighth lenselement comprises at least one critical point, a vertical distance ofthe critical point on the image-side surface of the eighth lens elementand the optical axis is Yc82, and the following conditions aresatisfied:0.3<f/R16<5.0; and0.01<Yc82/f<0.90.
 12. The image capturing optical assembly of claim 1,wherein each of relative distances between every adjacent lens elementsof the first lens element, the second lens element, the third lenselement, the fourth lens element, the fifth lens element, the sixth lenselement, the seventh lens element and the eighth lens element is aconstant value, an entrance pupil diameter of the image capturingoptical assembly is EPD, an axial distance between the image-sidesurface of the eighth lens element and an image surface is BL, and thefollowing condition is satisfied:2.0<EPD/BL<6.2.
 13. An imaging apparatus, comprising: the imagecapturing optical assembly of claim 1; and an image sensor disposed onan image surface of the image capturing optical assembly.
 14. Anelectronic device, comprising: the imaging apparatus of claim
 13. 15. Animage capturing optical assembly comprising, in order from an objectside to an image side: a first lens group, a second lens group and athird lens group; wherein the first lens group comprises, in order fromthe object side to the image side, a first lens element and a secondlens element; the second lens group comprises, in order from the objectside to the image side, a third lens element, a fourth lens element anda fifth lens element; and the third lens group comprises, in order fromthe object side to the image side, a sixth lens element, a seventh lenselement and an eighth lens element; wherein each of the first lenselement, the second lens element, the third lens element, the fourthlens element, the fifth lens element, the sixth lens element, theseventh lens element and the eighth lens element has an object-sidesurface facing towards the object side and an image-side surface facingtowards the image side; wherein at least one surface of at least one ofthe lens elements of the second lens group is aspheric, and at least onesurface of at least one of the lens elements of the third lens group isaspheric; wherein the image-side surface of the eighth lens element isconcave in a paraxial region thereof and comprises at least oneinflection point; wherein at least one of the eight lens elements has anAbbe number smaller than 20; wherein a maximum of refractive indexes ofall the lens elements of the image capturing optical assembly is Nmax,the image capturing optical assembly further comprises an aperture stop,an axial distance between the aperture stop and the image-side surfaceof the eighth lens element is SD, an axial distance between theobject-side surface of the first lens element and the image-side surfaceof the eighth lens element is TD, and the following conditions aresatisfied:1.30<Nmax<1.95; and0.70<SD/TD<1.10.
 16. The image capturing optical assembly of claim 15,wherein the object-side surface of the seventh lens element is convex ina paraxial region thereof, and the image-side surface of the seventhlens element is concave in a paraxial region thereof.
 17. The imagecapturing optical assembly of claim 15, wherein the image-side surfaceof the second lens element is concave in a paraxial region thereof; amaximum optical effective radius of the object-side surface of the firstlens element is Y11, a maximum optical effective radius of theimage-side surface of the eighth lens element is Y82, and the followingcondition is satisfied:0.20<Y11/Y82<0.70.
 18. The image capturing optical assembly of claim 15,wherein a maximum of axial distances between every adjacent lenselements of the image capturing optical assembly is ATmax, a maximumimage height of the image capturing optical assembly is ImgH, and thefollowing condition is satisfied:ATmax/ImgH<0.30.
 19. The image capturing optical assembly of claim 15,wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, a maximum image height of theimage capturing optical assembly is ImgH, an entrance pupil diameter ofthe image capturing optical assembly is EPD, and the following conditionis satisfied:TL{circumflex over ( )}2/(ImgH×EPD)<3.40.
 20. The image capturingoptical assembly of claim 15, wherein an Abbe number of the first lenselement is V1, an Abbe number of the second lens element is V2, an Abbenumber of the sixth lens element is V6, and the following condition issatisfied:(V2+V6)/V1<1.0.
 21. The image capturing optical assembly of claim 15,wherein an axial distance between the object-side surface of the firstlens element and an image surface is TL, a maximum image height of theimage capturing optical assembly is ImgH, a focal length of the imagecapturing optical assembly is f, an entrance pupil diameter of the imagecapturing optical assembly is EPD, and the following condition issatisfied:2.0<TL/ImgH+f/EPD≤3.20.
 22. The image capturing optical assembly ofclaim 15, wherein the second lens group has positive refractive power,and the third lens group has negative refractive power.
 23. An imagecapturing optical assembly comprising, in order from an object side toan image side: a first lens group, a second lens group and a third lensgroup; wherein the first lens group comprises, in order from the objectside to the image side, a first lens element and a second lens element;the second lens group comprises, in order from the object side to theimage side, a third lens element, a fourth lens element and a fifth lenselement; and the third lens group comprises, in order from the objectside to the image side, a sixth lens element, a seventh lens element andan eighth lens element; wherein each of the first lens element, thesecond lens element, the third lens element, the fourth lens element,the fifth lens element, the sixth lens element, the seventh lens elementand the eighth lens element has an object-side surface facing towardsthe object side and an image-side surface facing towards the image side;wherein at least one surface of at least one of the lens elements of thesecond lens group is aspheric, and at least one surface of at least oneof the lens elements of the third lens group is aspheric; wherein theimage-side surface of the eighth lens element is concave in a paraxialregion thereof and comprises at least one inflection point; wherein atleast one of the eight lens elements has an Abbe number smaller than 20;wherein a maximum of refractive indexes of all the lens elements of theimage capturing optical assembly is Nmax, an axial distance between theobject-side surface of the first lens element and an image surface isTL, a focal length of the image capturing optical assembly is f, and thefollowing conditions are satisfied:1.30<Nmax<1.95; andTL/f<1.60.
 24. The image capturing optical assembly of claim 23, whereinthe second lens element has negative refractive power, the object-sidesurface of the second lens element is convex in a paraxial regionthereof, and the image-side surface of the second lens element isconcave in a paraxial region thereof; the first lens element, the secondlens element, the third lens element, the fourth lens element, the fifthlens element, the sixth lens element, the seventh lens element and theeighth lens element are made of plastic materials.
 25. The imagecapturing optical assembly of claim 23, wherein the axial distancebetween the object-side surface of the first lens element and the imagesurface is TL, an entrance pupil diameter of the image capturing opticalassembly is EPD, and the following condition is satisfied:1.0<TL/EPD<2.27.
 26. The image capturing optical assembly of claim 23,wherein a focal length of the image capturing optical assembly is f, acurvature radius of the image-side surface of the eighth lens element isR16, and the following condition is satisfied:0.3<f/R16≤3.39.
 27. The image capturing optical assembly of claim 23,wherein there is an air gap in a paraxial region between each ofadjacent lens elements of the image capturing optical assembly; at leastone surface of at least one of the lens elements of the first lens groupcomprises at least one inflection point, at least one surface of atleast one of the lens elements of the second lens group comprises atleast one inflection point, and at least one surface of at least one ofthe lens elements of the third lens group comprises at least oneinflection point; the axial distance between the object-side surface ofthe first lens element and the image surface is TL, and the followingcondition is satisfied:TL<12.0 mm.
 28. The image capturing optical assembly of claim 23,wherein the focal length of the image capturing optical assembly is f, afocal length of the second lens group is fG2, a focal length of thethird lens group is fG3, and the following conditions are satisfied:−0.4<f/fG2<1.5; and−1.5<f/fG3<0.5.
 29. The image capturing optical assembly of claim 23,wherein the image-side surface of the seventh lens element comprises atleast one critical point, a vertical distance of the critical point onthe image-side surface of the seventh lens element and the optical axisis Yc72, and the following condition is satisfied:0.01<Yc72/f<0.90.